UA Rival Women's Muscle Tank

Under Armour's everyday lines fit true to size with a deliberately roomy, athletic-loose cut rather than a tailored one.

Owner reviews of the core Rival Fleece hoodies and joggers repeatedly land on "true to size," with the cut described as loose and comfortable rather than baggy — several hoodie owners say to size down only if they want a trimmer fit. Sizing guides likewise report the brand fits true to your usual size once you pick the right cut, since Under Armour labels pieces by cut (loose vs. fitted vs. compression) and the fitted and compression styles are intentionally much snugger than the casual gear. Reviewers note the tees and tops run long and boxy rather than fitted, and a minority of jogger buyers found the slimmer athletic cuts snug enough to size up.

Sizing advice: Order your usual size in the casual fleece, tees, and joggers — size down only if you want a closer fit in the roomy cuts, and expect the fitted/compression-labeled styles to run much snugger by design.

Per owner & reviewer reports: Under Armour Rival Fleece Hoodie Reviews — Zappos · Under Armour Rival Fleece Joggers Reviews — Zappos · Under Armour sizing guide — OPUMO Magazine

What's my size at Under Armour?

Independent lab reviews describe Under Armour's technical tops as made mainly from polyester with a relaxed, non-fitted cut and raglan sleeves. Testers note the seams use simple overlock stitching rather than flatlock construction, so seams can sit raised rather than lying flat, and the fabric itself is described as a bit slippery to the touch rather than soft. On the plus side, reviewers report the fabric holds its integrity after repeated washing and dries quickly, with one outlet clocking a dry time of about 20 minutes in testing, and call it strong value against pricier technical tees.

Strengths

Reviewers consistently note quick drying and fabric integrity across repeated washes, calling it strong value for a budget technical tee.

Watch out for

The overlock (not flatlock) seams sit raised rather than flat, and the polyester fabric is described as slippery rather than soft to the touch.

Sizing

Reviewer testing describes the fit as relaxed and slightly long rather than tailored, with no underarm gussets, so expect more room than a fitted athletic cut.

About Under Armour's tops line as a whole. Sources: Under Armour Tech 2.0 Review | Tested & Rated · Under Armour Tech T-Shirt Review (2025): Comfortable & Durable - Outdoor Gear Guides