This Snugpak Poncho Liner is not your fathers, or Grandfathers, Poncho Liner. Unlike the older square-shaped style Poncho Liner many have come to know the Snugpak Poncho Liner has a dedicated hood with drawcord as well as dedicated sleeves. No more cold chills when lifting up your arms while wearing a Poncho. The other great news is the Snugpak® Poncho Liner is compatible with pretty much any poncho on the market, though it does work best with Snugpak's Enhanced Poncho. Why do you ask? Well is simply because the Snugpak Enhanced Poncho too has dedicated sleeves and because of this fact, the Poncho Liner acts like a jacket liner to insulate and improve the performance when needed, or desired.