Each protective heat pad is sewn with 30/3 Natural Kevlar thread with 6 stitches per inch double stitching continuously around the pad with X design in center.

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3 layer Maximum protection from heat of hot metal
 

1 layer 4 oz. Thermal PLM Leather
 

1 layer 24 oz. wool
 

1 layer 17 oz. Natural woven Kevlar.