100% Polyester Drawstring , Elastic Waist Band closure Rothco's Army Physical Training Shorts Were Designed After the New APFU (Army Physical Fitness Uniform) Optional Wear Regulations Rothco's Army PT Shorts Feature Enhanced Performance Fabrics Designed With the Athlete in Mind The Outer Shell of PT Shorts are Constructed Of 100% Polyester for Durability and Side Panels Featuring a Poly/Spandex Blend For Added Stretch and Movement For Added Comfort Rothco's Athlectic Shorts Are Equipped With A Drawstring and Elastic Waist for an Ideal Fit and Boxer Style Inner Liner The PT Shorts Also Features a Hidden Waist Pocket Near The Left Leg