Lux foam is your best version of polyurethane foam. It is extremely firm but comfy to sit on. It is going to easily return to its original shape even when you sit on it for hours. This is more expensive so it has a longer life span compared to polyurethane one. Even although the quality is good, it is not encouraged to use lux foam for outdoor use.
Outdoor chair requires better remedy to fight from the weather, so it is advised to use specific outdoor cushions. Kitchen chair seat cushions are also called dry-fast memory foam or open cell foam. When it is wet, the cushions will absorb the water, however the open mobile will circulate it outside immediately so that the cushions won’t be ruined.