After a bit of R&D tinkering with this new product, I've settled on the 11" shield and the mid size base plate for my height of 5' 10" and average build. Couldn't be happier. By far the best shield I've ever owned, IMHO. As always, your preferences my differ. Haven't used it in really cold weather yet but have done some riding with temps in the mid thirties. The protection is great. Yes, we do get some cool weather up here in central California.