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First let me say that these are really comfortable and low profile. I wore them twice for a full day on the slopes and forgot they were there, and nobody noticed them under my snow pants. They also helped with falls to the hip.
So why 2 stars? Because the coccyx (tailbone) pad is waaaaaaay too narrow. It essentially makes any hit you take to the rear focus right on the bone. I know this because I caught a heel edge on my snowboard and took a major wack on hard pack snow. The entire force was taken by the narrow pad and redirected to my coccyx. Without the pad I would have taken the hit on the meat of my butt on either side of the bone instead. It would have hurt, but I wouldn't be wincing two days later. To be effective the pad needs to extend across the sides to raise the point of impact off the tailbone. Think of a donut around the bone, instead of this configuration which just fills in the gap that should be protected.
The Burton brand is almost the exact same short, but with a much bigger tail pad - and 3x the price for the brand name. That's why I got this pair instead, but since this pair probably got me closer to a broken butt than not wearing protection I'm going to try another option.