Grub's Highline Full Rubber Wellington BootsHIGHLINE by Grub's is a classically styled full rubber wellington with a side bellow to allow width adjustment around the calf. The TRAK sole pattern, which offers a deep tractor like tread, gives powerful traction on soft ground with a prominent heel for downhill braking. Additionally the HEXZORB technology insert in the heel acts like a shock absorber and reduces impact pressure on hard surfaces. Neoprene Flex Panel Comfort Rating: +20C to 10C TRAK