These Voile Straps are made of tough stretch polyurethane. They also have a UV-resistant additive to increase their lifespan. Their heat-treated aluminum buckle features a slim profile. This is super-important for packing efficiency and extra durability. Few things in life are as reliable as the original Voile Strap. Over the last 30 years they have become the ultimate alternative to duct tape, nylon straps, and bungee cords. Pair these with the Voile Strap Keepers to hold the end down once you’ve clipped your gear.