This beautiful design is created by using Increases (Inc 1) and Decreases (S1K1 PSSO & k2tog). The underside is a Slip 1,P1 design which makes it VERY durable. It will last through all it's washings. You can take it on and off, over and over again and the shape will remain. It will not stretch out, like elastic. It will also be nice and snug on your arm. It will stay put. I made this pattern to last and to be comfortable. A couple important things.