Stay cool and free up your arms for a better range of motion with Jerzees by Russell Athletic Essential Sleeveless Muscle. Made for reduced distractions, this muscle features moisture-wicking technology, odor protection to keep the fabric fresh, and a UPF 30+ rating to protect you from harmful UV rays. Enjoy the style and comfort of cotton with benefits of performance. 100% cotton Machine wash cold Tumble dry low Approximate measurements (flat lay): armpit to armpit: 28" length: 29"