The Padlock Connection System is unique to 661 Protection. Our answer to the biggest issue in “mountain bike safety”; pad migration during a crash. Our Padlock technology inter connects with our protection pieces to create a locked chassis ensuring your pads won’t migrate. The core of our system is the Evo Compression Jacket & Evo Compression Short that attached to each other and connect into an array of elbow and knee protection pieces. Letting the rider find the perfect level of protection for any ride.