The Under Armour Tactical Full T is probably the best thing you can wear under your operational clothing. The HeatGear material from Under Armour ensures that you have a permanently comfortable body feeling, as it effectively wicks moisture away from your body, keeping you dry and cool. Breathability that is second to none. Under Armour's Tactical Line is used by most of the world's special forces and armies. Nothing will maintain your performance in hot areas better than this shirt. Loose fit: Normal cut, not bodyhugging and not fitted. Under Armour Heatgear products for use in warm and hot temperatures. UPF 30 provides a sun protection rating of 30 Antibacterial materials to reduce body odour Flatlock seams Lightweight: 170g/size medium 100% polyester Under Armour chest logo and ID labelling area on waistband.