Poron XRD is a microcellular urethane foam that absorbs over 90% of impact energy when you hit it hard. Unlike basic EVA foam, it's a "smart" material that stays flexible during normal movement but firms up on impact—similar to D3O and SAS-TEC, but with a noticeably thinner profile.
It's a great choice if you want protection that's barely noticeable under your ski pants. Athletic skiers who prioritize mobility and a low-profile fit often prefer Poron XRD because it doesn't add bulk while still delivering solid impact absorption on the slopes.
The main trade-off is long-term durability. Poron XRD can break down faster than D3O or SAS-TEC over multiple seasons of heavy use, so if you ski dozens of days per year, you may need to replace your protectors sooner. For occasional skiers who want comfortable, discreet protection, it's an excellent option.