Nylon Spandex Fabric: The Complete Guide
Nylon spandex is the most widely used performance stretch fabric in the world — and the backbone of professional swimwear, dancewear, activewear, and costume construction. If you've ever worn a swimsuit that moved with your body, held its shape after hours in the pool, and still looked great at the end of the season, there's a good chance it was made from nylon spandex.
This guide covers everything you need to know before buying or sewing with nylon spandex: the different types available, how GSM affects your project, what stretch percentage means in practice, which garments it's built for, the most common sewing mistakes to avoid, and answers to the questions we hear most often. Whether you're a home sewer working on your first swimsuit or a designer sourcing fabric for a full production run, this page gives you the information to choose and use nylon spandex with confidence.
In this guide:
- Types of Nylon Spandex Fabric
- What Nylon Spandex Is Best For
- Technical Details: GSM, Stretch & Fiber Ratios
- Sewing Tips & Common Mistakes
- Frequently Asked Questions
- Shop Nylon Spandex
Types of Nylon Spandex Fabric
Not all nylon spandex is the same. Weight, finish, fiber ratio, and construction all affect how a fabric performs and what it's best suited for. Here's a breakdown of the main types you'll find in our collection.
Solid Nylon Spandex
The standard, clean-surface nylon spandex in a single color. Available across a full spectrum from black and white to neons, pastels, jewel tones, and nude shades. The go-to choice for swimwear, leotards, and activewear where the fabric itself is the design. Typically available in 130–180 GSM for most applications.
Printed Nylon Spandex
All-over prints applied to a nylon spandex base using reactive or sublimation dyeing. Includes florals, geometric patterns, abstract designs, animal prints, tropical motifs, and seasonal collections. The print is bonded into the fiber — not surface-coated — so it stretches with the fabric without cracking or fading.
Metallic Nylon Spandex
A shiny, reflective surface finish applied over a nylon spandex base. Catches and reflects light beautifully — popular for competition dancewear, skating costumes, stage performance wear, and fashion swimwear. Requires gentle care to maintain the metallic finish.
Hologram Nylon Spandex
Prismatic, color-shifting surface that creates dramatic multi-color light effects under stage lighting or direct sunlight. A staple for figure skating dresses, competitive dance costumes, and performance fashion. The hologram effect is embedded into the fabric surface and moves with the stretch.
Foil Nylon Spandex
Mirror-bright foil applied to the fabric surface for maximum visual impact. Bolder and more high-contrast than metallic finish. Used in stage costumes, carnival and festival wear, and competition suits where standout appearance is the goal.
Nylon Spandex Swimwear Fabric
A specific category of nylon spandex engineered for aquatic use — selected for chlorine resistance, UV stability, wet opacity, and fast drying. Not all nylon spandex is swimwear-grade; swimwear fabric is tested and selected specifically for performance in water.
Swimwear Fabric
Engineered for water use and durability.
Mesh & Lining
Stretch mesh and power mesh for lining and support.
What Is Nylon Spandex Fabric Best For?
Nylon spandex is one of the most versatile performance fabrics available. Its combination of softness, stretch, strength, and water performance makes it the material of choice across a wide range of garment categories.
Swimwear
Swimwear is the most common application for nylon spandex. The fabric's four-way stretch allows it to conform to the body in every position, its quick-dry properties make it comfortable in and out of water, and its smooth surface resists snagging on pool edges and rough surfaces. Used for bikini tops and bottoms, one-piece swimsuits, tankinis, swim dresses, and athletic competition suits.
For heavy pool use (lap swimming, water polo, competitive training), consider polyester spandex for improved chlorine resistance. For fashion swimwear, resort collections, and recreational use, nylon spandex delivers superior softness and color depth.
Activewear
Used for leggings, sports bras, and gym wear.
Dancewear & Performance Costumes
Dance studios, costume designers, and competitive performers have relied on nylon spandex for decades. It moves with the dancer without restriction, photographs beautifully under stage lighting, and holds its shape through physically demanding routines. Used for leotards, dance shorts, lyrical dresses, bodysuits, and unitards.
Metallic, hologram, and foil nylon spandex are especially popular for competition and stage costumes where visual impact is as important as performance.
Activewear & Athletic Apparel
The stretch and recovery of nylon spandex makes it ideal for activewear that must flex and return to shape through repeated movement. Used for leggings, sports bras, yoga shorts, running tights, compression shorts, and gym tops. Lighter weights (130–150 GSM) are preferred for everyday activewear; heavier weights (160–200 GSM) for compression-focused pieces.
Gymnastics & Figure Skating
Gymnastics leotards and figure skating dresses demand fabrics that offer maximum freedom of movement, body-conforming fit, and visual presence. Nylon spandex — particularly in hologram, metallic, and solid jewel tones — is the dominant fabric in both sports.
Rash Guards & Water Sports
Heavier nylon spandex (180–220 GSM) is used for rash guards, surf suits, and water sports apparel where coverage, durability, and UV protection are priorities. For high-UV environments or prolonged daily water use, look for UPF-rated nylon spandex options.
Cosplay & Costume Construction
Nylon spandex is a favorite in the cosplay community for full-body suits, superhero costumes, and body-conforming character builds. Its ability to stretch over complex shapes while returning to form makes it uniquely suited for structured costume construction. Printed nylon spandex allows full-character colorways to be realized in a single fabric panel.
Fashion & Resort Wear
Beyond performance applications, nylon spandex is widely used in fashion swimwear, resort collections, festival wear, and body-positive fashion garments. Its versatility across weights and finishes allows designers to create everything from minimal triangles to fully structured fashion pieces.
Technical Details: GSM, Stretch & Fiber Ratios
Fiber Ratios Explained
The ratio of nylon to spandex in the blend affects stretch behavior, recovery strength, and fabric feel. Here are the most common ratios and what they mean in practice:
- 80% Nylon / 20% Spandex — Industry standard for swimwear and dancewear. Maximum stretch, excellent recovery, softest hand feel. The most versatile and widely used blend.
- 82% Nylon / 18% Spandex — Slightly firmer. Common in athletic compression garments and structured activewear.
- 85% Nylon / 15% Spandex — More structured, less stretch. Used in rash guards, performance panels, and moderate compression wear.
- 90% Nylon / 10% Spandex — Low stretch, strong body. Used for lining fabrics and technical panels where minimal give is required.
For most swimwear, dancewear, and general activewear projects, an 80/20 blend is the correct starting point.
Understanding GSM (Fabric Weight)
GSM — grams per square meter — measures how dense and heavy the fabric is. In nylon spandex, GSM directly impacts coverage, opacity, structure, and feel. Choosing the wrong GSM is one of the most common causes of disappointing results in home sewing projects.
- 80–120 GSM — Lightweight: Sheer to semi-sheer. Best for swimsuit lining, overlay panels, soft-cup tops, and lingerie. Not recommended as a standalone outer fabric for swimwear.
- 130–160 GSM — Mid-weight: The sweet spot for most swimwear and dancewear. Good opacity, excellent stretch, smooth surface. Ideal for bikinis, one-pieces, leotards, and leggings.
- 160–180 GSM — Medium-heavy: More coverage and structure. Best for one-piece swimsuits with support panels, athletic swimwear, rash guards, and compression leggings.
- 180–220+ GSM — Heavy: Maximum coverage, firm recovery, moderate compression. Used for water polo suits, competitive race suits, structured performance wear, and compression garments.
Four-Way Stretch: What It Means
Four-way stretch means the fabric extends and recovers in both the lengthwise (warp) and widthwise (weft) directions. This is essential for fitted garments that follow body movement in every direction. Most nylon spandex knits are true four-way stretch fabrics. Two-way stretch fabrics — which only stretch in one direction — are not suitable for swimwear or close-fitting athletic garments.
Stretch Percentage
Stretch percentage describes how far a fabric can extend beyond its resting length before recovering. A fabric with 50% stretch can extend from 10 inches to 15 inches and return. Most nylon spandex swimwear fabrics stretch between 50% and 100% in both directions. Higher stretch percentages allow for more body-conforming fit; lower percentages produce a more structured, controlled result.
Chlorine & UV Resistance
Nylon spandex offers good chlorine resistance for recreational swimwear — typically holding up well through a full season of regular pool use with proper care. For competitive or daily pool use, polyester spandex offers superior chlorine durability. UV resistance in nylon spandex is moderate; UPF-rated options are available for sun-intensive applications such as rash guards and surf suits.
Nylon vs. Polyester Spandex — Quick Comparison
- Softness: Nylon wins — softer, silkier hand feel
- Color depth: Nylon wins — richer, more saturated solid colors
- Chlorine resistance: Polyester wins — better for heavy pool use
- UV resistance: Polyester wins — more stable under prolonged sun exposure
- Print quality: Polyester wins for sublimation; nylon wins for reactive dye
- Price: Similar across comparable quality tiers
Sewing Tips
- Use stretch needle
- Use zigzag stitch
- Use polyester thread
- Do not use straight stitch
Sewing Nylon Spandex: Tips & Common Mistakes
Nylon spandex is one of the most rewarding fabrics to sew — but it has a few quirks that catch beginners off guard. These tips will help you get clean, professional results from your first yard.
Use a Ballpoint or Stretch Needle
This is non-negotiable. A standard sharp needle will pierce and break the knit loops in nylon spandex, causing skipped stitches, snags, and seam failure. A ballpoint or stretch needle (size 75/11 or 80/12) slides between the loops rather than cutting through them. Replace your needle before every project — a dull needle causes more problems in stretch fabric than in any other material.
Never Sew with a Straight Stitch
A straight stitch has no flexibility. When nylon spandex is stretched — which it will be every time the garment is worn — a straight-stitch seam will pop immediately. Use a narrow zigzag stitch (1.5–2mm wide, 2–2.5mm long), a built-in stretch stitch, or a 4-thread serger overlock. These stitches stretch with the fabric and recover without breaking.
Reduce Thread Tension
Standard sewing machine tension is set for woven fabrics. On nylon spandex, too-tight tension causes puckered seams. Reduce your upper thread tension by 1–2 steps from your default and test on a scrap piece before sewing your project. The seam should lie flat at rest and stretch without the thread pulling.
Use Polyester Thread
Polyester thread has enough elasticity to flex with stretch stitches without snapping. It also resists chlorine and UV degradation — essential for swimwear. Cotton thread breaks down in chlorinated water and will not survive even moderate pool use. Wooly nylon thread is excellent in the serger looper for seam allowances that sit against the skin.
Cut Without Stretching
Nylon spandex has a tendency to creep while being cut, especially on a slick table surface. Lay it flat on a cutting mat, secure with pattern weights or fine pins, and cut with a sharp rotary cutter. Never stretch the fabric taut while cutting — the pattern piece will be distorted and the finished garment will not fit as intended.
Test Wet Opacity Before Cutting
This step is skipped by most beginners and regretted by all of them. Nylon spandex — especially in light colors and lower GSM weights — can become partially transparent when wet. Before cutting your full pattern, wet a scrap piece and hold it up to light. If the opacity is insufficient, switch to a higher GSM fabric or add a lining layer.
Press Gently
Spandex fibers are heat-sensitive. High iron heat will melt or distort the elastane content and permanently damage the fabric's stretch and recovery. Always press nylon spandex on a low setting with a pressing cloth, using steam from above rather than direct contact. Do not iron metallic, foil, or hologram finishes directly.
Common Mistakes to Avoid
- Using a straight stitch: It will pop. Always use a stretch-compatible stitch.
- Not testing tension on a scrap: Puckered seams are almost always a tension issue — catch it on scrap, not on your finished piece.
- Buying too little fabric: Always add 10–15% extra to your yardage estimate. Nylon spandex cannot be restocked in the same dye lot.
- Choosing the wrong GSM: Too light and the fabric is sheer; too heavy and you lose the stretch and drape the design calls for.
- Tumble drying finished garments: Dryer heat degrades elastane rapidly. Always air dry flat or on a hanger in the shade.
- Skipping lining in light colors: Any nylon spandex under 160 GSM in white, pale pink, nude, or light yellow should be lined to ensure wet opacity.
Frequently Asked Questions About Nylon Spandex Fabric
What is nylon spandex fabric used for?
Nylon spandex is used for swimwear, dancewear, activewear, gymnastics and figure skating apparel, rash guards, compression garments, cosplay, and performance costumes. It is the most widely used base fabric for any fitted garment that requires four-way stretch, durability, and a smooth surface finish.
Is nylon spandex good for swimwear?
Yes — nylon spandex is the industry-standard fabric for fashion and recreational swimwear. It has good chlorine resistance for regular pool use, UV stability for outdoor wear, quick-dry properties, and excellent color depth. For competitive or heavy pool use (daily lap swimming, water polo), polyester spandex offers better long-term chlorine durability.
What is the difference between nylon spandex and Lycra?
Lycra is a brand name for elastane/spandex fiber made by Invista. Nylon Lycra and nylon spandex refer to the same type of fabric — a blend of nylon and elastane. The only practical difference is whether the elastane component uses the branded Lycra fiber or a generic elastane. Both produce excellent stretch fabric when blended with quality nylon.
What GSM nylon spandex should I use for a swimsuit?
For most swimwear, a mid-weight nylon spandex in the 140–170 GSM range is the best choice. This weight offers good opacity, reliable four-way stretch, and a smooth surface feel. Lighter weights (under 130 GSM) may lack opacity when wet; heavier weights (over 190 GSM) may reduce the stretch and drape expected in fashion swimwear.
Does nylon spandex shrink when washed?
Nylon spandex is very stable and does not shrink significantly under normal washing conditions. Washing in cold water and air drying will maintain the fabric's original dimensions reliably. Hot water washing or tumble drying can cause minor shrinkage and, more importantly, degrades the elastane content — reducing stretch recovery over time.
Can I use nylon spandex for leggings?
Absolutely. Nylon spandex is an excellent legging fabric, particularly in the 150–180 GSM range. It provides good coverage, moves with the body, and holds its shape through workouts. Lighter weights are better for fashion and casual leggings; heavier weights for athletic compression and high-impact activities.
How do I stop nylon spandex from rolling at the edges?
Edge rolling is common in nylon spandex, particularly in lighter weights. Sew seams promptly after cutting to prevent curling at the edges, and use a serger to trim and overlock seam allowances cleanly. For hems, a twin needle or cover stitch creates a professional, flat finish that resists rolling. Cutting with a rotary cutter rather than scissors also reduces edge distortion.
What thread should I use for nylon spandex?
Use 100% polyester thread for your sewing machine needle — it handles the flex of stretch stitches and resists chlorine and UV degradation. For serger loopers, wooly nylon thread produces the softest seam allowances and excellent seam coverage. Avoid cotton thread entirely; it breaks down quickly in swimwear applications.
How much nylon spandex do I need for a swimsuit?
A standard bikini (top and bottom) requires approximately ⅔ to 1 yard of fabric plus an additional ½ yard for lining. A one-piece swimsuit requires approximately 1.25 to 1.75 yards of outer fabric plus ¾ to 1 yard of lining fabric, depending on the design and your size. Always add 10–15% extra to account for fitting adjustments and pattern placement.
Is nylon spandex the same as swimwear fabric?
Not exactly. All swimwear fabric is nylon (or polyester) spandex, but not all nylon spandex qualifies as swimwear fabric. Swimwear-grade nylon spandex is specifically selected for chlorine resistance, UV stability, wet opacity, and fast drying. General nylon spandex sold for dancewear or activewear may not meet these standards. Always verify the fabric is described as swimwear-grade before using it in aquatic garments.
Shop Nylon Spandex Fabric
All of our nylon spandex fabrics are sold by the yard with no minimum order. Browse by type, weight, finish, and color to find exactly what your project calls for.
- Shop All Nylon Spandex →
- Shop Swimwear Fabric →
- Shop Printed Spandex →
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- Shop Mesh →
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