Midline 5.0™ is insulated and waterproof, with excellent grip, made for all day comfort. The ankle height boot is perfect for those who do not enjoy wearing a full-length wellington but do not want to compromise on the quality. •5mm Insu-Foam Ultra™ - gives all round foot comfort and insulation. •6mm Nitrocell™ Footbed - provides a soft cushioning for an athletic shoe feel. A million microscopic nitrogen bubbles that insulate the wearer from cold surfaces.•Underfoot chassis™ - give a sure-footed platform. •Hexzorb™technology - absorbs heel strike shock for daylong comfort. •Superdri™ lining - is hard wearing, wicks moister away from the wearer's foot to prevent a sweaty and uncomfortable feel. It is fungus and rot proof so will not smell like cotton-lined boots. •Trax™ outsole - superior grip on a variety of surfaces, the tread is designed to work with the action of the foot. Comfort rating -  -20ºc to +20ºc.•We recommend purchasing the same uk size as your regular daily footwear, such as a trainer.•Grubs boots have a 15mm allowance for a woolblend / thicker sock which also means if you are a half size, we recommend sizing down.