Extra high boots for extra levels of protection. This extra high shoe makes the heavy duty line complete and provides added protection. Now also heat and cold insulated (HI and CI). Ankle protection "Comfort Sponge" with added padding provides a more comfortable feel and better fit. Mammoet M1807 is very easy to put on and take off; the vertical eyelets on the shoe make lacing the fire-retardant laces very simple. Thanks to the new lacing there's no need for a zip.