Perfect Fit – Kevlar™ Aramid fibers Sleeves feature DuPont™ Kevlar™ Aramid fibers brand fiber and are available in a variety of lengths, widths, and configurations. Kevlar™ Aramid fibers engineered fiber is 5 times stronger than steel on an equal weight basis and provides excellent protection from cut, slash, and abrasion hazards. Kevlar™ Aramid fibers are also flame-resistant and can withstand heat up to 900°F (400°C) without degrading.