New Balance Mens Speed 2-in-1 Short Elastane^Polyester Imported Machine Wash^Tumble Dry New Balance Clothing Size Guide Get those arms and legs pumping like pistons in the sleek Speed 2-in-1 Short. Lightweight polyester fabrication. Elastic waist features an interior drawstring for a secure fit. Built-in brief increases comfort and support. Key pocket at interior left. Reflective elements increase visibility in low-light conditions. 100% polyester.Brief: 90% polyester, 10% elastane. Machine wash cold, tumble dry low. Imported. Measurements: Waist Measurement: 30 in Outseam: 17 in Inseam: 6 in Front Rise: 13 in Back Rise: 18 in Leg Opening: 28 in Product measurements were taken using size MD, inseam 6. Please note that measurements may vary by size.