The Ampire from Marker has Hybrid Shell Construction keeping it light weight and still offering great protection. Add the 360 Degree Edge Protection in common impact zones and you've got even more protection for when your crown hits the ground. The Ampire has a Two Position Climate Control that allows you to adjust the vents to cool you down if you start to get warm on the mountain. If you want a helmet that won't break the bank, but offers up all the options you want in a helmet, the Marker Ampire is a perfect choice
Helmets are measured in center meters around the crown of the head.
Medium : 55 cm - 59 cm
Large : 59cm - 62cm