With regard to windshields :- I've been riding for the best part of 50 years, and NEVER been able to get one adjusted properly. I hate 'em. I always wear a ¾ helmet with a face shield. My latest helmet (an LS2) has the biggest face shield I've ever worn. You can pull it partly down (click, click, click principle) to just protect the eyes, or fully down to just under chin level, to protect the whole face.It also has a second, smoked, shield, operated by a little lever at the side, so you don't need sunglasses. I reckon it's the best helmet I've ever had, & definitely no need for a windshield.