If you prefer sunglasses, choose a wrap style with the least amount of distortion at the sides that you can find. Sure They Fit. Take the time to adjust the strap to your head. If the strap is a complete pain to adjust, or if the buckle doesn't stay in adjustment, move on. Some styles have softer, more rubbery buckles that won't dig into your scalp.
Wider bands are more comfortable than narrower ones.
And foam inserts keep out wind, ice, and dirt. The foam should be thick enough to help cushion your face if you fall, but not so dense that it encourages fogging. The salesperson should be able to help you make this judgment. If you wear glasses, make sure the goggles will fit over them. Many optical stores, especially those near ski areas, will make up prescription inserts for goggles, so you won't need glasses at all.