1 inch thick. Different sizes are done using three different shell sizes.   DOT Certified : Yes This helmet meets or exceeds DOT FMVSS 218 specifications.   Vintage Helmet Features:  - Super Light Weight  - EPS Liner Thickness : Only 1 inch  - Fabric Helmet Bag and Owners Manual included  - Quality Plush Interior  - Goggle Holder in the back   - Stainless Steel Dual D-rings  - DOT clear coated in the back  - Great quality materials and workmanship  (less)

1 inch thick. Different sizes are done using three different shell sizes.   DOT Certified : Yes This helmet meets or exceeds DOT FMVSS 218 specifications.   Vintage Helmet Features:  - Super Light Weight  - EPS Liner Thickness : Only 1 inch  - Fabric Helmet Bag and Owners Manual included  - Quality Plush Interior  - Goggle Holder in the back   - Stainless Steel Dual D-rings  - DOT clear coated in the back  - Great quality materials and workmanship  (less)