SIZE GUIDE

Welcome to the ACTIVE by GS size guide. Our premium activewear collection is designed to celebrate every body, offering inclusive sizing from XS to 2XL.

To find your perfect fit, please use our comprehensive charts below, which are based on true body measurements. Because our garments are engineered with high-performance four-way stretch fabric, you can easily customize your fit based on your preferred level of support and daily activity.

  • Style Notes: Any specific fit variations (such as relaxed or compression cuts) are clearly noted under each category below and on individual product pages.
  • Need Expert Advice? If you need help choosing the right size, our friendly Customer Care team is here for you. Connect with us @activebygs and email us directly at hello@activebygs.com

 How to measure_Active by GS

  Main global size chart_Active by GS

LEGGINGS & BIKE SHORTS SIZE GUIDES

Our leggings and bike shorts are crafted from a luxury-weight, ultra-soft natural blend designed to offer a supportive, second-skin fit. Featuring a premium four-way stretch compression technology with ultimate breathability, our pieces are engineered to move completely with your body while holding their shape for ultimate confidence.

How to Choose Your Size:

  • If you are between sizes: Select the smaller size if you prefer a firm, highly sculpted compression feel for high-impact training. Choose the larger size if you prefer a smooth, everyday comfort fit around your waist and hips.
  • For the best coverage & opacity: To ensure a squat-proof experience, we recommend selecting a size where your measurements sit comfortably within our range. Keeping the luxury fibers relaxed ensures the fabric remains perfectly dense, rich, and completely opaque under any light.

A Note on the Waistband: Out of the packaging, the high-rise waistband is designed to feel beautifully snug. This intentional engineering ensures your leggings and shorts lock firmly into place, staying completely put without rolling, sliding, or digging in during your workout.

Active by GS Bamboo Leggings & Bike Shorts Size Chart

Butter soft bamboo activewear size chart

SPORTS BRA SIZE GUIDE

Crafted from our signature, luxury-weight natural blend, our sports bras are engineered to deliver a locked-in, second-skin fit that moves seamlessly with you. The fabric is uniquely rich, supportive, and adaptive, designed to gently mold to your unique shape within minutes of putting it on.

How to Choose Your Size:

  • If you are between sizes: Select the smaller size if you prefer a firm, high-performance feel with maximum support and bounce control. Choose the larger size if you prefer added breathing room and all-day comfort around your ribs.
  • If your measurements cross over: If your bust and under-bust measurements point to two different sizes, always choose the size that matches your bust measurement. This ensures the best cup coverage and a beautiful shape with zero side-spillage.

A Note on Your First Wear: Out of the packaging, the supportive under-bust band is designed to feel quite snug. This is completely intentional to ensure your bra never slips, rides up, or loses its shape during movement. Within a few minutes of your workout, it will adapt perfectly to your body.

Sports Bra size chart CM & INCHES_Active by GS


SHORTS SIZE GUIDE (LOUNGE & RUN SHORTS)

This guide applies to our lounge and everyday active shorts. (For Bike Shorts, please use the Leggings & Bike Shorts Guide above).

  • The Golden Rule: If your waist and hips cross into two different sizes, always choose the size that matches your waist measurement.

Style Fit Advice:

  • Lounge Shorts (Relaxed Fit): Intentionally cut for a flowy, loose fit. Fits true to size. Size down only if you prefer a snug, closer fit.
  • Running Shorts (Performance Fit): This style is streamlined and runs small. For optimal comfort, unrestricted stride movement, and the best fit through the waistband, we strongly recommend sizing up by one full size from your usual activewear size.

 Shorts general size chart CM & INCHES_Active by GS

TOPS SIZE GUIDES (TEES, TANKS & CAMIS)

Our tops follow true body measurements. (For Sports Bras, please refer to our dedicated SPORTS BRA SIZE GUIDE above).

  • The Golden Rule: Always prioritize your bust measurement to ensure the garment sits comfortably across your chest and shoulders.

Style Fit Advice:

  • Tees (Loose Fit): Designed with an intentional, relaxed drape. Fits true to size. Size down only if you prefer a standard, tailored fit.
  • Camis (Snug Fit): Engineered to sit close to the body for a secure, contoured silhouette. If you prefer extra breathing room, we recommend sizing up.
  • Tanks (Standard Fit): Perfectly balanced between comfort and movement. Go for your normal size, or size down for a firmer fit.

TOPS general size chart CM & INCHES_Active by GS

Still not sure about your size? Chat with our Customer Care team via Live Chat or shoot us an email at hello@activebygs.com.