It’s a tape that has strong adhesive and a felt-like backer that you would tape over a blister or chafed spot in a boot or shoe. The adhesive is sweat proof, and the felt backer both pads the sore area and also prevents further sliding and rubbing that leads to chafing and more blisters.
In a pinch, you can also use it to patch worn-through insoles.
It’s a tape that has strong adhesive and a felt-like backer that you would tape over a blister or chafed spot in a boot or shoe. The adhesive is sweat proof, and the felt backer both pads the sore area and also prevents further sliding and rubbing that leads to chafing and more blisters.
In a pinch, you can also use it to patch worn-through insoles.
You don’t tape it over the blister, you cut a hole for the blister