The fronts and back are happily blocking on a old beach towel on the bottom bunk in the guest room. The sleeves would be blocking, except I ran out of pins and towel space. The only reason I have any pins at all is because when my brother and I were little, we would collect the pins at department stores. (See, I’ve always been weird) The pins with green heads were the best. They’re probably awful and germy, but they block well enough.