Feel + firmness
TieStart with what these two are, because the Casper gets miscategorised constantly: the Casper Original is a hybrid, not an all-foam bed. AirScape perforated foam sits over pocketed coils in an 11″ profile, at 6/10 medium, with zoned support that firms up under the hips and softens under the shoulders. The Purple RestorePremier is also a hybrid over pocketed coils, but taller at 13″ — a 3″ GelFlex Grid, a buckling polymer lattice rather than foam, over 10″ of CoolFlex coils — and Purple publishes its feel as "soft" rather than as a number.
Those two labels are not comparable, and pretending otherwise is how buyers get surprised. Casper's medium is the medium most people already know: a bit of foam give, coils underneath, gentle contour, no drama. Purple's "soft" is adaptive rather than plush — the Grid stays firm until a body part pushes hard enough to buckle a column, so hips and shoulders drop in while your lumbar stays supported. It feels springy and slightly hollow under you, which some buyers love immediately and some never get used to. Purple's own product notes flag that as its first drawback.
We're calling this a tie because it isn't a quality gap, it's a preference gap — and it's the single biggest factor in this comparison. Nothing in either spec sheet tells you which side you're on. If you can't try the Grid somewhere first, treat the 100-night trial as the actual product feature you're buying.

