Top-Quality Heavy-Duty, 2 mm Split-Leather Gauntlet. Reinforced Palm, Thumb, and Index Finger. Thornproof - Hypodermic needle puncture-resistant under ASTM F2878 - 2010. Twaron Heat-Resistant Thread for Increased Life-Span. 100% Cotton Liner on the Palm and Fingers, Cotton does not melt when in contact with a flame, unlike Synthetic Fibres.