Thunder C Solid Full Face Motorcycle Helmet
A high performance full-face motorcycle helmet designed for the worlds most demanding racetracks – The LS2 Thunder Carbon Full-Face Street Helmet was designed by a team including our engineers in... Read More
A high performance full-face motorcycle helmet designed for the worlds most demanding racetracks – The LS2 Thunder Carbon Full-Face Street Helmet was designed by a team including our engineers in Spain and our riders from Moto 3, Moto 2, WSBK and FIM EWC. Together, they developed the safest, most innovative performance helmet on the market. The lightweight, aerodynamic Pure Carbon Fiber shell slices through the wind and remains stable on your head. We use 3 shell sizes to offer a perfect fit. The eye port is taller allowing you to look farther down the track when tucked-in. The eye port is extra wide so you can see who’s pushing you into the corners. The optically correct face shield swaps quickly and easily using tool-less quick release technology. This race-ready 3mm flat shield comes with tear-off posts and uses the Pinlock system for the ultimate in fog resistance. The Emergency Quick Release System removable cheek pads are precision cut from one solid piece of high quality foam using LS2’s 3D Laser Technology. The technical fabric liner is fully removable and washable (we recommend you wash by hand and air dry). The fabric wicks moisture to help keep you dry and comfortable. Fully adjustable flow-through ventilation allows you to stay cool. The Thunder uses a traditional “Double-D Ring” strap for a secure fit. Whether you’re a racer, sport rider, or commuter, you’ll find the performance you need. This model has an INTERMEDIATE OVAL fit. The fit is snug, but comfortable for those long endurance races or high speed jaunts, we call it the 200 M.P.H. fit. Designed at LS2 world headquarters in Barcelona, Spain. Meets or exceeds FIM, DOT and ECE certification (FIM is the standard of Moto G.P.)
- SHELL | Meets or exceeds DOT FMVSS 218, ECE 22.05, and FIM FRHPhe-01. 1390g +/-50g. Size XS-2XL. 9K Carbon Fiber. 3 Shells.
- COMFORT | Highest quality, removable, washable, technic liner wicks moisture to keep you cool. 3D Laser-cut cheek pad day comfort with no hot spots.
- VISOR | 3mm thick flat racing shield. A Class Polycarbonate is optically correct. Includes Pinlock MAX insert for optimal fog resistance. Pinlock ready shield includes tear off posts.
- SECURITY I Double D-ring strap for a secure closure. Emergency Release Cheek Pad System. State-of-the-art multi-density EPS.
- VENTILATION | Fully adjustable, multi-port, dynamic, flow-through ventilation with neled EPS to keep you cool.
How to measure
Measure the circumference of your head with a tape measure, starting above the ear, circling completely around about half an inch above the eyebrows and across the fullest part of the back of the head. Measure several times for accuracy. If you fall between two sizes, choose the larger; the helmet should be as snug as possible without causing pain.
LS2 Helmets size chart
| Size | Head circumference (cm) | Head circumference (inches) |
|---|---|---|
| XS | 53-54 | 20 7/8 - 21 1/4 |
| S | 55-56 | 21 5/8 - 22 |
| M | 57-58 | 22 1/2 - 22 7/8 |
| L | 59-60 | 23 1/4 - 23 5/8 |
| XL | 61-62 | 24 - 24 3/8 |
| 2XL | 63-64 | 24 3/4 - 25 1/4 |
| 3XL | 65-66 | 25 5/8 - 26 |
| 4XL | 67-68 | 26 3/8 - 26 3/4 |
Youth sizes
| Chart | Size | Head circumference (cm) | Head circumference (inches) |
|---|---|---|---|
| Rapid Mini (kids street full-face) | S | 47-48 | 18 1/2 - 19 |
| Rapid Mini (kids street full-face) | M | 49-50 | 19 1/2 - 19 3/4 |
| Rapid Mini (kids street full-face) | L | 51-52 | 20 - 20 1/2 |
| Gate Youth (youth MX) | S | 51-52 | 20 - 20 1/2 |
| Gate Youth (youth MX) | M | 53-54 | 20 7/8 - 21 1/4 |
| Gate Youth (youth MX) | L | 55-56 | 21 5/8 - 22 |
One official LS2 USA adult chart (XS-4XL) for all adult models; different head shapes may need a size up/down in a given model, and models use multiple shell sizes. Two model-specific youth charts (Rapid Mini street, Gate Youth MX) — they differ, use the right one per model.
Manufacturer sizing data · verified July 8, 2026