Those living in colder temperatures will put insulation higher on the priority list, whereas foot pain requires more advanced support and additional cushioning.

Closed-back slippers: These cover your entire foot, and tend to offer an optimal blend of comfort, support, protection, and warmth — especially for those who get cold easily. 

While many styles are comfortable and plushly padded, moderate to warm climates might require a more open style. Closed-back styles can be tough to get on and are not as breathable as other alternatives.

Comfort: This is the foundation of decision-making when it comes to finding the right slippers. A well-cushioned sole with soft materials and the proper fit are all important factors, but comfort is subjective for each wearer. 

Those living in colder temperatures will put insulation higher on the priority list, whereas foot pain requires more advanced support and additional cushioning.

Sole: Whether your slippers are meant for indoor or outdoor use, a sturdy sole is important to prevent skidding on hard floors as well as more dangerous incidents with errant sharp objects and kid's toys on the floor. 

Thin soles also provide no insulation and can lead to sore feet. Try to find waterproof soles with good shock absorption, such as Ethylene vinyl acetate (EVA) rubber.