Opal earns its keep on long days, the kind where you're walking more than you expected and your usual sandals are already complaining. An enhanced-grip rubber outsole keeps your footing steady on nearly any surface, and a plush quick-drying lining keeps feet cool and dry no matter the weather. Tailored support and a subtle medium arch give it a personalized feel for extended wear, and at just 0.365 lbs a pair, you genuinely forget you have them on. The built-in arch support helps with alignment and eases pain linked to plantar fasciitis, flat feet, and heel discomfort, while the gentle nylon toe post and cushioned yoga mat footbed add soft, shock-absorbing comfort to every step. Opal is endorsed by the APMA, so this comfort has real credibility behind it, not just a nice-sounding claim. Stick with what you normally wear. Between sizes or wide feet? Round up, not down (a 7.5 becomes an 8). This is a medium width fit. The Size Chart has exact measurements if you want to be sure.