The Kask Rapido Road Cycling Helmet is an entry-level helmet that is molded with the highest quality of materials, designed with unique elegance attributable to Kask. Kask's utilized their In Moulding technology, joining the inner polystrene cap to the outer polycarbonate one, to offer better shock absorption when you need it. The Medium and Large weight in at 220 grams and 240 grams respectively. While it's certainly not the lightest helmet on the market, it is not the heaviest. With 24 vents, there will certainly be no over heating when wearing the Rapido. The click wheel adjustment system makes the helmet a dream to wear offering pristine comfort.