Not for Skiing or Boarding!!
Ok, so the 4 star rating is for the increased knee stability and perceivably increased endurance (5 stars if the compression was a little higher -- I fit squarely in the 'large' and would prefer a little more leg squeeze). I originally got these for snowboarding and there is something that is entirely outside of the design of the tight but something potential buyers should know (if you ski and snowboard). The slick nature of tights cause socks to bunch down over time. I used these my first time out with some smartwool ski socks. Got blisters on my heels. Switched out to Icebreaker socks and at the same time had switched to the 3/4 insulator -- no blisters entire season. Got warmer, went back to the full tight and, once again, sock bunching and blisters. My assumption is that the 3/4 gives you enough leg to hold the socks up and keep from bunching. This has happened with snow board boots and will probably happen with ski boots as well. Temp is going down this week so I'll be back in the 3/4 insulator, so I'll update if there is this doesn't hold up (same pair of socks). But if you're looking at the full for snow sports...go with the 3/4.