Underworks Mens Microfiber Compression Crew Neck T-shirt 3-Pack MicrofiberNylonSpandex Made in USA Sizes: Measure Chest in Inches: Small 32-35 / Medium 36-39 / Large 40-44 / X-large 45-48 / 2X 49-52 / 3X 53-69 MENS PERFORMANCE COMPRESSION crew neck shirt - Snug feel. Provides elegant compression to slim you down and shape your whole upper body. SHAPES YOUR CHEST, TUMMY, AND SIDES - INVISIBLE UNDER CLOTHING - smooth feel and breathability from silky microfiber nylon that moves with you in all directions. QUICKER RECOVERY FROM EACH WORKOUT - Wearing the Performance Compression crew neck shirt will help in quicker recovery of your muscles after your workout or ball game. MADE IN THE USA - High quality construction and made with the finest materials for maximum durability and service to you