Featuring a breathable, perforated design, these sport bands were ested, endorsed and approved by Fitbit Ambassadors like tramarathoner Dean Karnazes, cycling legend Jens Voigt and pro-runners Ryan & Sara Hall. The Fitbit Charge 2 sport band is made of a flexible, durable elastomer material similar to that used in many sports watches, and includes a surgical-grade stainless steel buckle. The Charge 2 sport band is sweat, rain and splash proof, but it�s not swim proof. We recommend taking it off before showering, as it�s better for your skin if the band stays dry and clean. If the Charge 2 sport band gets wet or if you sweat in it, remove and completely dry the band before putting it back on. Give your wrist a rest by taking the band off every now and then.