ADV Essence 2-in-1 Stretch Shorts are our favorite lightweight shorts offering ergonomic fit and excellent function. Made of recycled polyester with great stretch and featuring elastic inner tights, these advanced 2-in-1 training shorts are the go-to item for most kinds of intense physical activities. Recycled polyester. Woven, functional stretch fabric. Inner tights for optimal support. Ergonomic fit for optimal freedom of movement. Adjustable drawcord inside waistband. Hidden back pocket.