The Equivizors fit true to size. The X Full fits my Clyde/Hackney/TB cross mare who has a true Draft size head - its enormous - and she takes a Draft sized bridle
The Full fits all my TB’s, and my finer WB’s and my yearling WB/TB cross filly is in a Cob size
The UV protection on the upper part of the Equivizor is 100% and the remainder of the mask is about 75-80% due to any wear in that area if they rub it on posts, etc - it is the same as any other fly mask - what UV protection it offers as new will deteriorate with use depending on how hard they are on it
All of my foals start wearing fly masks at about 2-4 days of age. They get used to them early and Ive never had an issue with them - ever - wearing them. They also all wear the fly masks with ears - Im sure the little gnatty flies bug their ears as much as anyone else
I think its all what you get them used to early on. They are leading by 2-3 days old (well - “dragging/carrying with a butt rope” might be a better way of describing it in the early days!", I will spray them with water in a bottle to get them used to being fly sprayed in the first few days, their feet are handled and picked up and a halter / fly mask on and off are all part of their daily routine