Oil resistant rubber. 5mm CR foam bootie is lightweight and flexible. X -Stabilizer for additional lateral support at foot and ankle. Slip-resistant Chevron outsole and heel provide sure-gripping traction on slick footings. Exposed CR Foam bootie at top for greater flexibility and stretch. 100% waterproof. Supportive heel counters reduce heel slippage and provide form-fitting comfort. Removable 6mm NITRACEL™ EVA insole for additional support and slipper-soft molded comfort in the footbed. Ideal for commercial fishing, oil fields, dairy farming and canneries.