Bear Matrix 3D The Original - Unmatched Staple Fit No Pull-Down No Gathering Soft 4-Way Stretch Fabric 90% Polyester 10% Spandex Blend Size Chart: S: 6-8 M: 8-10 L: 10-12 **Runs Small The Ethika Boys Staple underwear represents Form Fit and Function and is based off the same great fit we use for our Mens product.