Grubs Speyline Boot are a very sturdy traditional waterproof field sports knee-high wellington boot built with the Tractor tread TRAK which ensures great stability underfoot in all types of weather. This outstanding boot is built with the Bristol Vibram outsole, a classic heavy lugged sole filled with pillow like Poly-urethane for all day comfort. For added warmth and flexible comfort has a 3mm Insufoam-ultra lining which traps and holds in the warmth and a gusset for ease of wear in the colder months. The full height rubber shaft features a classic side gusset and winch strap. Available in a choice of colour and sizes UK 6-13 Bristol Vibram outsole for outstanding traction Classic heavy lugged sole Sole filled with soft polyurethane for all-day comfort Side gusset and winch strap for the perfect fit around the calves 3mm Insufoam lining for warmth and comfort Temperature comfort rating: +20C to -20C Colour: Mahogany, Moss Green; Size: UK6 EU39/40, UK7 EU41, UK8 EU42, UK9 EU43, UK10 EU44/45, UK11 EU46, UK12 EU47, UK13 EU48