New Balance - Mens Performance Base Layer Compression Muscle Tank Top NB00901TS, Red, Lightning Dry Moisture Control, Compression 4 Way Stretch, Anti-Odor, Anti -Microbial, This Superior Moisture Wicking Fabric Made From Hydrophobic Polyester Yarns is Dedicated To Keeping Your Skin Dry, You'll Love How Comfortable You Feel No Matter The Intensity Of Your Workout, Size Small = Chest 39 Inches Waist 28-30 Medium = Chest 40.5 Inches Waist 32-34 Large = Chest 42.5 Inches Waist 36-38 Extra Large = Chest 44.5 Inches Waist 40-42, 87% Polyester 13% Elasthane, #25584