New Balance Mens 9" Performance Shorts Polyester New Balance Clothing Size Guide Focus on your task ahead in the New Balance&reg; 9" Performance Shorts. Lightweight polyester shorts feature perforated detail at the sides for added ventilation. Elastic waistband. Side hand pockets. Reflective logo provides increased visibility in low-light conditions. 100% polyester. Machine wash cold, tumble dry low. Imported. Measurements: Waist Measurement: 29 in Outseam: 20 in Inseam: 9 in Front Rise: 13 in Back Rise: 16 in Leg Opening: 26 in Product measurements were taken using size MD, inseam 9. Please note that measurements may vary by size.