In this video I cut my Decathlon made B'twin mountain bike helmet in half to see what's made inside. Want to support this channel? https://www.patreon.com/bruceChastain or check out my Amazon store: https://www.amazon.com/shop/hackandridebikes 🔗 Some of my links 🔗 https://www.facebook.com/groups/HACKANDRIDEBIKES https://www.instagram.com/bruce_chastain https://www.strava.com/athletes/10076302 http://www.BruceChastain.com