IRH has a new helmet for around $50 that looks like a classical velvet covered hat but it's lightweight and ventilated! IRH Medalist Helmet - ASTM/SEI Certified Helmets from SmartPak Equine
IRH has been a wonderful company to work with. I have a SSV and absolutely love it. Last summer at the end of a jumping session I brought my mare to a walk and she bolted and bucked me off for no apparent reason (later found out it was a saddle fit problem and the jumping had caused the saddle to slip back and pinch her), at any rate, I landed full force on my head, and while my helmet cracked, I walked away with only a moderate concussion, nothing worse.
The next day I was supposed to ride in a jumping clinic and did not, but went to watch it, and my trainer told me that IRH has a replacement program where they will put up $75 towards the purchase of a new one (helmets should replaced every 3 years or after each fall/impact). True to her word, they did, and even went down a size as I lost about 30lbs and seem to have lost some in my head lol...
Great company, and Smart Pak is top notch, I believe there are some free ship codes floating around right now too with their winter sale going on.