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Testers have racked up 14,000 miles in the new TIDELINE™ testing SUPERLITE® technology. This new technology has been designed to reduce weight and make these the lightest GRUBS® boots in our collection. At just 1kg per pair and created to mould around your foot, they offer support in all weathers throughout the day. TIDELINE 4.0™ is insulated and waterproof, with excellent grip, made for all day comfort. The Calve height boot is perfect for those who do not enjoy wearing a full-length wellington but do not want to compromise on the quality.  4MM INSU-FOAM ULTRA™ - gives all round foot comfort and insulation.  5mm POLYOU™ 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. SUPERLITE® technology - makes this boot 30% lighter than conventional rubber boots, buoyant and extremely comfortable thanks to its' moulded shape. 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. TRAIL-GRIP™ 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 wool blend / thicker sock which also means if you are a half size, we recommend sizing down.