Maximum Coverage in All Conditions TLD's A1 helmet is a lightweight, fully encapsulated all-mountain helmet utilizing maximum coverage and dimension to keep you safe and protected in all riding conditions. Whether you're charging single track, riding dirt jumps or grinding out miles on the XC bike, the A1 helmet offers the premium fit, protection and style you want in a great new range of colours and graphics. MIPS Safety Technology MIPS stands for Multi-directional Impact Protection System, it is a revolutionary technology that lets the helmet slide relative to the head, adding more protection against rotational violence to the brain caused by angled impacts.