If you're looking to upgrade your gym wardrobe without breaking the bank, the Gainz Activewear Mystery Box is exactly what you need. Hand-picked leggings, sports bras, shorts, and matching sets — curated to your size and shipped fast. No subscription, no guessing, just premium activewear at unbeatable value.
Pick Your Box. We Pack the Rest.
Choose your size (S, M, L, or XL) and pick the box that fits your haul goals. Start with the 3PC for a taste, upgrade to the 6PC for the best value, or go all in with the 12PC for the biggest haul. Each box is curated with trending leggings, shorts, sports bras, and matching sets — no subscription, no guessing, ever.
- Sizes: S, M, L, XL
- Pieces per box: 3, 6, or 12
- No subscription required
Shop 3PC — $29 | Shop 6PC — $49 (Best Value) | Shop 12PC — $99 (Biggest Haul)
What's Inside the Gainz Box
3PC Gainz Box — $29
Your 3PC Gainz Box includes a curated mix of premium activewear: leggings, shorts, and a sports bra. Hand-picked for comfort, style, and versatility — ready to wear to the gym or every day. Perfect if you're trying us out for the first time.
6PC Gainz Box — $49 (Best Value)
Your 6PC Gainz Box includes leggings, shorts, sports bras, and matching sets. Twice the styles, double the value — curated to seriously upgrade your gym wardrobe. Our most popular box for a reason.
12PC Gainz Box — $99 (Biggest Haul)
The 12PC Gainz Box includes a curated mix of 12 premium pieces: leggings, shorts, sports bras, and matching sets. Our biggest haul, best value, and lowest cost per piece — ready to wear and ready to ship. At just ~$8 per piece, this is the ultimate activewear deal.
- Hand-picked activewear pieces
- Trending leggings, shorts, bras & sets
- Versatile, ready-to-wear styles
Why the Gainz Box Is the Best Value
More pieces. Better value. Bigger haul. Each Gainz Box is designed to give you the lowest cost per piece while upgrading your gym wardrobe with premium styles. Individual activewear pieces can run $30–$80+ at retail — our boxes flip that math entirely.
- Lowest cost per piece — as low as ~$8 with the 12PC
- Biggest activewear haul for your budget
- Premium styles curated by our team
- No subscription, no hidden fees, no guessing
How Your Gainz Box Works
Fast Shipping & Hassle-Free Returns
Every Gainz Box ships straight to your door with full tracking. Most orders are packed and shipped within 48 hours. If any item arrives defective or damaged, we'll replace it at no cost — no questions asked.
- Ships within 48 hours
- Free shipping included
- Defective items replaced at no cost
- No subscription required
Frequently Asked Questions
Can I pick my size?
Yes! You choose your size at checkout — S, M, L, or XL. Every box is curated specifically for your selected size so everything fits the way it should.
What activewear brands or styles are included?
The Gainz Box includes trending women's activewear styles — think buttery-soft leggings, seamless sports bras, biker shorts, and coordinating matching sets. Styles are curated based on what's trending and in stock, so every box feels fresh and current.
How fast will my box ship?
Most Gainz Boxes are packed and shipped within 48 hours of your order. You'll receive a tracking number as soon as your box is on its way.
Do I need a subscription?
No subscription — ever. Each Gainz Box is a one-time purchase. Order once, order often, or grab one as a gift. Totally up to you.
What if an item in my box is defective?
If any item arrives defective or damaged, reach out to our team and we'll replace it at no cost. Your satisfaction is guaranteed.
Which box size is the best value?
The 6PC Gainz Box at $49 is our most popular pick for value — you get double the pieces at a lower cost per item compared to the 3PC. If you want the absolute lowest cost per piece, the 12PC at $99 works out to roughly $8 per item.
Ready to Upgrade Your Gym Wardrobe?
Choose your Gainz Box and get premium activewear at unbeatable value. 3PC, 6PC, or 12PC — all hand-picked, packed, and ready to ship to your door.
Shop 3PC — $29 | Shop 6PC — $49 (Best Value) | Shop 12PC — $99 (Biggest Haul)
