This Columbia Montrail tank top offers sleeveless shirt is the perfect companion for hot days. The fabric is sweat-activated which means that when you sweat, the cooling system is activated and the fabric temperature goes down so you feel cooler and it also has a special wicking fabric to quickly draw sweat away from your body. In addition, the tee-shirt benefits from an antimicrobial treatment to prevent bacterial growth which causes germs and odours. For added ventilation, it features a mesh back and side panels. With drop tail hem and reflective detail.