This HH product offers both advanced moisture management through it's Lifa fiber technology and sun protection (UPF40) in a singlet construction ideal for any summer or indoor Sport activity. Lifa Flow is a construction combining Helly Hansen's unique Flow technology with Lifa stay dry technology fibers. Lifa Flow delivers super quick drying next to skin, faster than other base layers on the market, and guarantees that you'll always feel dry and comfortable. All you need to focus on is your own performance. Lifa Flow helps you to stay dry, comfortable and perform like a pro. Material: Lifa flow technology fabric.