Grubs Boots Highline Wellington Boot Green The Grubs Highline Wellington Boot is a classic traditional-looking pair of wellington boots with a full rubber shaft while incorporating an adjustable clasp with a tractor tyre-style tread on the outsole for superb grip. Ideal for dog walking and general use in most conditions. It also features a 4mm rubber foot with reinforced heels which provides stability, while the Trax sole gives powerful traction on soft ground. Grubs Boots Highline Wellington Boots in Green. Grubs Boots Highline Wellington Boots in Green. Highline is a classically styled full rubber wellington with side bellow to allow width adjustment around the calf.TRAK sole pattern - deep tractor like tread gives powerful traction on soft ground with prominent heel for downhill braking. HEXZORB TECHNOLOGY - insert in the heel that acts like shock absorber and reduces impact pressure on hard surfaces. 6mm NITROCELL FOOTBED - provides both cushioning and also insulation from the cold. COMFORT RATING -10ºc to +20ºc. Moisture wicking linings use thousands of fibre loops that cosset the foot and wick away moisture keeping the wearer dry and comfortable. Combined with 5.0 INSU-FOAM ULTRA to provide an unequalled comfort range without sweat and heat build up. UK SIZE   BOOT HEIGHT (mm on leg) CALVE WIDTH (circumference in mm) UK4 365mm 400mm UK5 370mm 400mm UK6 375mm 400mm UK7 380mm 400mm UK8 385mm 420mm UK9 395mm 430mm UK10 400mm 430mm UK11 405mm 440mm UK12 410mm 440mm UK13 415mm 450mm