Features: This nutcase bike helmet is specially designed for adult rider. Material use the tough and durable PVC PC, EPS foam which help absorb the impact and protect the head during crash. The adoption of specialized aerodynamic and ventilation design allow air go through the biking helmet which help increase the speed and keep stay cool. This biking helmet made of lightweight material, the inner pad use of breathable material to wear comfortably. This adult cycling helmet goes with a standard size, equipped with the easy-use dial system and side straps make this nutcase helmet adjustable to different head size and suitable for both men and women.