Mountain Bike Helmet ST 500 MOUNTAINEERING stretches and adapts for a

stretches and adapts for a super-snug fit- and provides superior stability

Parasol base diameter (base part): 2

Eco-design

based on customer feedback

and if they are frayed or oxidised

Mountain Bike Helmet ST 500 MOUNTAINEERING stretches and adapts for aDesigned for bike rides lasting over 2 hours. How do you choose your mountain bike helmet size? To find your helmet size, simply measure your head circumference (around the forehead). This mountain bike helmet is available in three sizes: S: 52 55 cm M : 55 59 cm L: 59 62 cm When should I replace my helmet? We recommend replacing your helmet in 2 cases: 1 After a fall: In the event of a fall, your helmet's material can deteriorate or even break.