adidas Y3 Men's Apparel Size Guide adidas® Y-3 by Yohji Yamamoto™ Sport Unif ISTR Pants loose fit silhouette. Button front with zip-fly closure. Side hand pockets. Back patch pockets. Straight hem. 100% polyester. Machine washable. Imported. This item may ship with an attached security tag. Merchandise returned without the original security tag attached or a damaged tag may not qualify for a refund.