The flexible frame also helps the helmet to fit into a bag or drawer as it is made of strips of plastic coated EPS joined by nylon bands. I found the squishability (technical term) useful when packing for the weekend, or when stashing it in a pannier for a cake break. This flexibility also means that if you find getting a helmet to fit you is quite difficult, the Carrera's ability to mound to different shapes might give you a perfect fit at last.