Comfortable sandals should hold your foot without forcing your toes to grip the footbed. Check that your heel and forefoot sit within the sole, with enough space around the edges for normal movement. If your foot spills over the sides, try another width or shape. Straps should feel secure but should not dig into the skin.
Adjustability can make a big difference. Multiple straps or adjustable closures let you fine-tune the fit as your feet change during the day. Try the sandals with clean, dry feet and walk on a safe surface. Notice whether the foot slides forward, the strap rubs, or the sole feels awkwardly rigid under your stride.
Match the sandal to the activity. A simple slide may suit short errands, while longer walks often call for a more secure fit and a sole that feels comfortable over distance. Water-friendly materials can be useful near pools or beaches, but check how quickly they dry and whether they become slippery when wet. No sandal makes every surface safe.
Wear a new pair for a short outing before planning a full day in them. Inspect your skin afterward for persistent hot spots. Clean materials according to their care needs and let damp sandals dry away from direct heat. The best choice is one that feels stable and comfortable in the conditions you expect.