MIPS stands for Multi-directional Impact Protection System. It's a thin, low-friction layer inside the helmet that allows your head to slide about 10-15mm on impact. This matters because most real ski crashes are angled hits — like catching an edge and slamming the side of your head — not straight-on impacts. Angled impacts cause your brain to rotate inside your skull, which is a leading cause of concussions. MIPS helps reduce those rotational forces.
It's become the industry standard and is available in helmets at nearly every price point. It adds almost no weight and typically costs just $20-40 more than a non-MIPS version of the same helmet.
Given how common concussions are in skiing, MIPS is absolutely worth it. No helmet is concussion-proof, but MIPS is proven to reduce the rotational forces that cause them. For any skier or snowboarder, it's the single most important safety feature to look for beyond basic impact certification.