Fit & Design: Single Layer Engineering Controls odor and inhibits bacterial growth on fabric Wicks and aids in moisture evaporation Brushed inside for warmth and comfort Extended body and sleeves for ultimate athletic fit Raglan Sleeve Drop tail Tagless, Flat Seams offer added comfort Technology: ColdPruf(R) Technical Fiber Polyester with SILVADUR(TM) Intelligent Freshness Additional Details: 85% Microfiber Polyester 15% Spandex