NIKE 5" Phenom Two-in-One Men's Running Shorts, Volt, Large Body: Dri-FIT 86% polyester/14% spandex. Gusset lining: 100% recycled polyester. Lining: Dri-FIT 84% recycled polyester/16% spandex. Center back liner: Dri-FIT 80% recycled polyester/20% spandex. Imported Dri-FIT fabric to wick sweat away and help keep you dry and comfortable Built-in stretch boxer briefs for support and freedom of movement Elastic waistband with internal drawcord for a snug, comfortable fi Mesh side panels for ventilation Back zip pocket for secure small-item storage