The Grubs Snowline 8.5 boot is a high performance field boot, designed for extreme winter weather and for those who intend on being outdoors for sustained periods of time, and in temperatures as low as -40º C. To achieve this level of insulation, the Grubs Snowline 8.5 Boot has a fleece lining, a 3mm Highloft air trap layer, a 5mm foam insulation layer and then a tough texturised nylon outer layer. If that is not enough, there is also a 2mm layer of rubber vulcanised onto the foot and lower calf to ensure a completely robust and waterproof boot. A truly fantastic boot specification. With the Grubs Snowline you will also experience the fantastic Vibram outsole and Duralite lightweight shock absorbing mid sole so you can navigate on any terrain imaginable and be assured that you are provide with superior grip. Features of The Grubs Snowline 8.5 Wellington Field Boots: INSU-FOAM ULTRA - Containing a polyester fleece lining combined with Grubs HIGHLOFT liner for ultimate in warmth and comfort. 8.5 TECHNOLOGYgt. Removable 6mm NITROCELL footbed - A nitrogen bubble structure increases the cushioning and insulative properties of the boots foot bed SUPER-DRI lining UNDER FOOT CHASSIS HARD-TOE technology 2mm Natural Rubber Shell Operate in Temperatures -10ºC to 30ºC (85ºF to sub zero)! Self Hardening Layers Of Epoxy Impregnated Material Also Featuring the VIBRAMMULTI-SPORT outsole with shock absorbing DURALITE lightweight mid-sole.