Sorbothane Double Strike Insoles are designed for activities where both the forefoot and heel are subject to the most impact shock. An inbuilt comfort contour, shock absorbing heel cup and added shock absorption in the forefoot area provides a comprehensive shock absorbing solution.
Sorbothane is a unique synthetic material which mimics the characteristics of human flesh. Its molecular structure allows it to recover its shape completely after each "shock" and, used as an insole in footwear, it absorbs 100% of the shock waves caused by walking or running on hard surfaces. That means it reduces muscle fatigue, helps protect weak joints and eases the strains on ligaments and tendons.
These footbeds take up almost double the room of most standard insoles that they will be replacing (they are 22mm high on the outside of the heel cup and 6.5mm high in the foot area), so they are not a good idea if your boot is already a tight fit, but they can be useful if it is a bit too roomy. You may need to trim the toe area to fit - this is easily done with a pair of scissors, just take out the existing insole and use it as a template to draw an outline of where to cut on your Sorbothane insole.
This new version is quite a bit lighter than the previous incarnation at 165g for a pair of size 10s.