Bella Tech is an active base layer designed for multisport use. It is lightweight, has a slim fit silhouette and is packed with features to deliver performance in all conditions. Bella Tech uses ultra-lite Merino Air-Con 140. Nature's climate control - It keeps you cool when you're hot, warm when its not. Breathable Merino Air-Con mesh back panel Raglan sleeves for extra mobility Dropped tail hem for extra coverage Contoured side body Thumb loops Size and Fit Fit : Slim Materials Main Fabric: Merino Air-Con Fabric Materials: 83% merino wool, 13% nylon, 4% elastane