Measured: No universal scale grades comfort itself, so each feature is judged on its own measurable term: arch contour, cushioning depth and rebound, a wet-floor slip test, or the presence of a sealed membrane.
The basics
What to know about comfort features
The word comfort on a product page commits the maker to nothing. Each feature on this page commits them to something specific and checkable. So the feature list deserves a closer read than the adjective ever does. The features solve different complaints: arch fatigue, heel impact, pressure points, slipping, wet feet. A shoe stacked with the wrong three does less for you than a shoe with the right one.
Start from your actual complaint. Feet that ache along the arch after standing need support, which is structure. Heels that hurt on concrete need cushioning, which is material. Sliding on wet floors needs an outsole compound and tread, which no insole can supply. Naming the problem first turns the feature list from marketing into a checklist.
Verify rather than trust: press into a footbed to feel whether an arch is really raised, pull at the insole to see if it lifts out, flex the sole, and read the tread. Every feature here can be checked in a minute in a store, or from a good photo set online.