Jockey Men's Underwear Knit Boxer 60% cotton/ 40% polyester jersey. Grey Heather: 90% cotton/ 10% polyester. Machine wash and dry. Imp Style 3633 experience laid back comfort at its best with our Jockey&reg; knit boxers boxers offer a relaxed fit and simple style for everyday wear crafted from a soft cotton blend for a smooth, comfortable feel knit boxers feature a clssic button-fly closure and signature Jockey&reg; elastic waistband