Grubs BEARLINETM boasts an 8.5mm layer of INSUFOAM-ULTRATM, a durable DURAPRENETM rubber and built with our FOOTFRAMETM underfoot technology for added support. With heel support and TOUGH-TOETM protection. Our BEARPAWTM sole is crafted from DRY-RUBBERTM sheets and textured to feel rough, we've strategically placed these pads within the outsole. The rest of the sole is moulded around these with soft rubber to securely hold them in place, delivering ULTIMATE PERFORMANCETM on slippery surfaces. Inside the boot features ULTRA-BOUNCETM which ensures lasting comfort and a spring in your step after a long, hard day.