Giro Aether MIPS Helmet Small Matte BlackThe Giro Aether MIPS Helmet is the next evolution of MIPS Technology after patiently watching and observing for many years. The new MIPS Spherical technology consists of six individual polycarbonate pieces, throws in a shatterproof AURA reinforcement arch, two layers of EPS Foam, to allow more movement and redirects more rotational energy than ever before. The Webbing is super light with Slimline buckles. There are sunglass docking ports in the front vents with grip. This helmet is ponytail compatible. Sizing: Small 20-21.75’’ or 51-55cm, Medium 21.75-23.25’’ or 55-59cm, Large 23.25-24.75’’ or 59-63cm. Available in Matte Black, Matte Blue, Matte White/Silver, Highlight Yellow/Black, Matte Black Flash, Matte Bright Red/Dark Red, Matte Black Pearl, and Matte Citron/White.768686178801