adidas ClimaCool Twin Stripe Jersey Polo Fit: Semi-Fitted--Slim, contoured fit for ease of movement and a stylish look. Fabric Type: Jersey--A stretchy (plain) knitted fabric, without a distinct rib, used widely for T-shirts Performance Technology: adidas ClimaCool--Provides cool comfort in even the hottest of conditions. ClimaCool actively conducts heat and sweat away from the body through a combination of heat- and moisture-dissipating materials, ventilation channels, and three-dimensional fabrics that allow air to circulate close to the skin. Anti-Microbial--Anti-microbial treatments provide permanent odor protection by inhibiting the growth of bacteria and mildew in the fabric. UV Protection--Fabric is treated to block UV (ultraviolet) radiation from the sun, helping to prevent sunburn.