Climbing on the sandstone towers of southern Utah is very special: there are almost no face holds but perfectly parallel cracks instead. The way to get up those is to insert some body appendix (hand, finger, fist, foot, knee, thigh...) then find a way to make it expand volume a bit, thus getting stuck. The trouble is that unless you have perfect technique, a little bit of slippage is likely to occur, and the rock feels like sandpaper... This is called a jam, no doubt because of the state in which your hands usually end up. One way to keep a bit of skin is to tape the hands, and here is my very first tape glove, in front of the desert.