Meet your new workout essential - the Rib Zip Up One Piece designed in collaboration with Pro Body Builder - Hattie Boydle. This fitted one-piece combines style and performance with its high neckline and front lockable zipper for adjustable coverage. Our lightweight rib fabric, combined with thick cross back straps and a deep V open lower back, enhances your shape. Internal shelf bra with removable padding offers support, while the new design includes non-stretch taping in the back rise seam for extra booty contouring.
Product Features
- True to size (Fitted)
- Lightweight active rib fabric
- High neckline with front lockable zipper
- Internal shelf bra with hem band and removable padding
- Thick cross back straps
- Deep V open lower back shaping
- New design with non-stretch taping in back rise seam for booty contouring
- Midway length
- Muscle Nation logo along side seam
- 76% Nylon, 24% Elastane
Size Guide
Model: Rachel - 169cm, wears size S in leggings / XS in Bras & Tees
Sizes below are approximate. Compare with a garment you already own and like. If between sizes, size up for a relaxed fit or down for a tighter fit.
| Size | US | Waist (in) | Waist (cm) |
|---|---|---|---|
| XXS | 0 | 24–25 | 61–64 |
| XS | 2 | 26–27 | 66–69 |
| S | 4 | 28–29 | 71–74 |
| M | 6 | 30–31 | 76–79 |
| L | 8 | 32–34 | 81–86 |
| XL | 10 | 35–37 | 89–94 |
| XXL | 12 | 38–40 | 97–102 |
How to measure
- Waist: measure around narrowest part of waist.
- Hips: measure around fullest part of hips and bum.
- Inseam: measure inside leg from crotch to ankle.
- Chest: measure around fullest part of chest.
Fit tips
- Compression pieces should feel snug but not restrictive.
- Training tops and tees are designed for movement.
- For a looser feel, go one size up.
Returns
We hope you love your new items! If you're not 100% satisfied, return within 30 days for a full refund or exchange. Sale items are final.
Shipping
- US — Free over $130, otherwise $9.99
- NZ — $10.00
- USA / UK — $12.00
- Europe — $14.00
Reviews
- ★★★★★
Excellent quality
Honestly the best gym apparel I've owned. Fit is true to size and the fabric holds up after dozens of washes.
Sarah M. · 12 Mar 2026
- ★★★★★
Worth every dollar
Bought two more in different colours after the first one. Comfortable for lifting and running.
Daniel R. · 28 Feb 2026
- ★★★★★
Great fit, slightly long
Love the cut and the colour is exactly as pictured. Length runs a touch long for me but otherwise perfect.
Priya K. · 14 Feb 2026
- ★★★★★
MN never disappoints
Quality is on par with my other MN Generation pieces. Shipping was fast and packaging was on point.
Marcus T. · 02 Feb 2026
