Smartwool Men's PhD&uml; Wind Boxer Brief 100% polyester 1.25" high 5.25" wide Form Fit - Mid Rise Warmer Merino/polyester blend helps fabric moves moisture, dry quickly, and maintain its shape in high-sweat activites in colder weather Windproof front panel for increased protection from the elements (1CFM Rating) Minimal Merrow seam construction provides superior durability and is soft against skin Jacquard logo elastic waistband with wool terry loop next to skin