XT ZIP SIDE LACE UP SAFETY BOOTWide fit sole sizing minimises trip hazards, eliminates rub zones and maximises surface area grip Bison Grip nitrile rubber out sole compound and multi directional tread design, delivers maximum grip on all surfaces Anti penetration IMFLEX insole uses thermoforming technology to allow for additional comfort at heel strike area as well as up to 20% more flex across the forepart of the foot, insole complies to ISO 20345: 2004 International Safety