David Archy Men's Winter Warm Rib Stretchy Base Layer Top & Bottom Fleece Lined Thermal Set Long John 50% Acrylic, 37% Rayon, 7% Cotton, 4%Polyamide, 2% Spandex Rib Stretchy Fleece Acrylic Fiber: Comparable to cashmere in heat-retention with fleece lined inside; close-fitting style does better in retaining body heat to keep you warm; rib stretchy for added comfort and softness. Heat Retention: ultra-soft & smooth fleece lined inside of the baselayer caresses the skin so naturally providing maximum comfort, softness and warmth. Double-layer Knee panel& Elbow sleeve panel: Thoughtful design for sleepwear set; more warmth, more durable; special care for your knee & elbow. Functional Fly: Considerate design on the thermal bottom with fly opening for easy-go when nature calls Crew Neck Tops: Round neckline designed to facilitate the movement of your neck for zero-impact activities To offer more choices for you, we have Mid-weight and Heavy-weight thermal tops and bottoms baselayer underwear set available in this winter. With our warm wicking long john thermals, you can freely enjoy your outdoor activities no matter hiking, jogging, riding, climbing, skiing etc. With delicate outer packing, the thermal set for men is made a perfect gift for your dad, husband, son, or friends. If you are looking for a great gift for Christmas, birthday, or other special occasion like one&#039;s wedding or anniversary - look no further. For more details, please kindly check below comparison chart and we bet you will definitely find your favorite baby!