Stay-cool Tank and T's wicking ultra breathable flatlock seams for comfort reflective details for safety 4-ounce 100% poly body panels and 4.1 ounce 100% poly mesh back/side panels. Inseam Trainer Shorts fabric vents in inseam and leg sides, covered elastic waistband and drawcord, top and bottom coverstitching. Womens shorts contoured piping, breathable mesh side panels, adjustable drawcord, interior pocket. All poly 100% (no cotton!) Tanks, T's and Shorts. Large polyester drawstring Sports Backpack 13"x18.5"x6.25" drink bottle pockets at both sides.