Troy Lee Designs Flowline MIPS Bike Helmet

The Flowline and A1 helmets both feature MIPS technology and cater to adult riders with options for men and women. The Flowline focuses exclusively on mountain biking, while the A1 offers versatility for multiple disciplines including mountain biking, road/time trial, urban commuting, and BMX, making it more adaptable for varied cycling activities. Both helmets come in a similar size range, but the A1 includes some additional sizing options like ‘One size’ and hybrid sizes such as M/L. Color options are broader with the A1 helmet, providing more variety for personal style. Overall, the Flowline is a solid choice if you are focused solely on mountain biking, whereas the A1 provides greater flexibility for riders who want a helmet suited for several different cycling environments.