Thermo boots made of natural rubber with extra reinforcement at the front. Designed with wool lining and removable thermal insoles. Made in 100% natural rubber with a 50% wool and 50% polyester padding. Technical details: Water-repellent, Wind-resistant. Size guide: 21: 13,9cm. 22: 14,5cm. 23: 15,2cm. 24: 15,7cm. 25: 16,7cm. 26: 17,2cm. 27: 17,8cm. 28: 18,9cm. 29: 19,7cm. 30: 20cm. 31: 20,5cm. 32: 21,1cm. 33: 21,8cm. Foot type: Normal - Wide.