Specs Classic Fit Medium Weight 4.6 oz. German Loopwheeled Jersey 100% Organic Cotton 1-Thread Yarn Unwashed Tubular Knit & Construction Rib Bound Crewneck Underarm Gusset Cold Wash & Hang Dry Made in Germany Sizing Model Measurements: 5'9" | 150 lbs. | 38" Chest | 32" Waist - Wearing Size 5/M Merz b. Schwanen is on the small side of true to size, and is made with a loom-state unwashed, loopwheel fabric that will have about a half (.5) size shrinkage upon first wash. For a classic-fitting garment, consider taking the larger size in your range, and for a relaxed fit, go one (1) size up. Our Sizing Guide provides garment-specific measurements taken in-house, per Our Method. These measurements are not duplicated across fabric or colorways and are re-measured each production run. Please feel free to Contact Us for additional assistance.