Hi everyone, this is my first time buying snowboarding gear. I need a jack and pants. I was told that shell is a good material but most of the sites that i go on have limited shell selection. Can someone please explain to me the difference between shell and dura shell. I was thinking of buying the Nomis Simon Chamberlain Shell Snowboard Pants Black. Right now they go for $190, 20,000mm/20,000m/24hrs Laminated Fabrics with Teflon DWR. Thanks!