While this cutter is about 5 times more expensive than the letter-opener variety, it makes trimming skins about 100 times easier. If you value your time and the quality of your cut, the math works out in your favor. Stick your untrimmed skins on your skis and run the trimming tool down the edges. The Pomoca Trimming Cutter is a well designed tool for trimming any brand of skins. It automatically offsets the cut to allow for the ski edge and has two blades for cutting both sides of the skin.