LS2 FF805 Thunder Carbon Helmet — Fermín Aldeguer 2025 Replica
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Size chart LS2 FF805
| Size | Head circumference (cm) | Head circumference (inch) |
|---|---|---|
| XXS | 51–52 cm | 20.1–20.5 in |
| XS | 53–54 cm | 20.9–21.3 in |
| S | 55–56 cm | 21.7–22.0 in |
| M | 57–58 cm | 22.4–22.8 in |
| L | 59–60 cm | 23.2–23.6 in |
| XL | 61–62 cm | 24.0–24.4 in |
| XXL | 63–64 cm | 24.8–25.2 in |
| 3XL | 65–66 cm | 25.6–26.0 in |
| 4XL | 67–68 cm | 26.4–26.8 in |
How to measure your helmet size correctly: To find the right helmet size, measure your head circumference with a flexible tape measure.
It is important that the tape measure runs around the widest part of the head – only then will you get a correct result.
Place the tape measure at the front, about 1–2 cm above the eyebrows, and run it along the sides above the ears.
At the back, the tape must run over the largest part of the back of the head (not too low on the neck). The tape may run slightly at an angle – what matters is that it sits all the way around the largest points of the head.
Make sure the tape measure sits snugly but does not dig in. Measure 2–3 times for the most accurate result. You can then compare the measured value in centimetres (cm) with our size chart.
Tips for an accurate result
- Keep hair flat (e.g. do not measure over a voluminous hairstyle)
- Keep the tape horizontal, i.e. along the largest circumference
- Do not measure too loosely
- For values between two sizes:
→ usually choose the larger size (depending on helmet model / fit)
Important note on fit
The right helmet should fit firmly without causing uncomfortable pressure points.
A new helmet may feel a little tighter at first, as the inner lining adapts slightly over time.
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- 14-day returns — in stock ships within 24h
Shipping & Returns
We ship with DHL and FedEx — express on request. If an item is in stock, express delivery can often go out within 1 business day. Standard delivery takes about 2–5 business days domestically and usually around a week worldwide. Please check the available shipping options and delivery times in your cart, as we offer several carriers depending on the country.
Returns must be registered in advance by email and are possible in line with our cancellation policy (14-day return request + 14-day return window after approval). Please note: unregistered returns are not accepted. You'll find all details on conditions, exceptions and refunds in our cancellation policy.
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The LS2 FF805 Thunder GP Aero Fermín Aldeguer 2025 Replica is where championship heritage meets the road. Born from the race livery worn by Ady Aldeguer during the 2025 season, this full-face carbon helmet carries its visual identity as seriously as its safety credentials — a rare thing in a replica-edition helmet at any price point.
Key Features
- Carbon 6K outer shell delivers a weight of approximately 1,280 g (± 50 g), reducing fatigue on long rides and track days alike
- Race-derived aerodynamic spoiler profile cuts lift and maintains stability at high speed
- Class A polycarbonate visor with anti-scratch coating, UV protection and Pinlock 120 Max Vision anti-fog preparation
- Visor quick-release mechanism with metal lock for tool-free changes in seconds
- Multi-inlet ventilation system — chin, front and crown intakes with rear exhaust channels — keeps airflow active throughout the shell
- ECE 22.06 certified with a Double-D-ring retention strap and multi-density ePS liner for category-leading impact absorption
- Fermín Aldeguer 2025 Replica graphics feature the season livery, bold line work, Glow Comprehensive reflective accents and exposed carbon weave
Design and Heritage
The Fermín Aldeguer 2025 Replica edition earns its name rather than borrowing it. The livery replicates the specific colour palette and graphic architecture used on Aldeguer's race helmet during the 2025 championship campaign. Exposed Carbon 6K weave is visible through the design, not hidden beneath it — the shell's structure becomes part of the aesthetic. Reflective Glow Comprehensive accents add low-light presence without diluting the competition character. If you are after a helmet that carries a genuine racing story, this is the one.
Shell, Safety and Construction
LS2 built the FF805 Thunder GP Aero around a Carbon 6K monocoque shell, keeping the finished helmet to approximately 1,280 g ± 50 g. The multi-density expanded polystyrene liner manages energy across different impact zones rather than applying a single-density compromise. Retention is handled by a Double-D-ring closure with a reinforced strap — the industry standard for race and track use. Emergency cheek-pad release tabs allow first responders to remove the helmet safely in the event of an incident. ECE 22.06 certification confirms the design meets current European road-legal requirements.
Aerodynamics and Visor
The GP Aero suffix is not decoration. The helmet's profile incorporates a racing spoiler geometry designed to reduce aerodynamic lift and suppress turbulence at elevated speeds, keeping neck load manageable during sustained high-speed riding. The panoramic visor offers a generous horizontal and vertical field of view. It is manufactured to optical Class A standard, treated with an anti-scratch hard coating and features UV protection as standard. The Pinlock 120 Max Vision preparation means the anti-fog insert can be fitted without modification — an important detail for variable British weather and early-morning track sessions alike.
Ventilation and Comfort
Ventilation inlets are positioned at the chin bar, the crown and the forehead, channelling air through the shell and evacuating heat via rear exhaust vents. The full interior lining is removable, machine washable and treated with an antibacterial finish to maintain freshness across long riding seasons. Reflective detailing on the shell improves visibility in low-light conditions without any action required from the rider.
Fitment and Compatibility
The LS2 FF805 Thunder GP Aero is a universal full-face helmet available across a broad size range. Three distinct shell sizes are used across the range to ensure proportionate fit at every head circumference, rather than stretching a single mould across all sizes. Use the table below to identify the correct size.
| Head circumference (cm) | Size |
|---|---|
| 51–52 cm | XXS |
| 53–54 cm | XS |
| 55–56 cm | S |
| 57–58 cm | M |
| 59–60 cm | L |
| 61–62 cm | XL |
| 63–64 cm | XXL |
| 65–66 cm | 3XL |
| 67–68 cm | 4XL |
Specifications
- Model: LS2 FF805 Thunder GP Aero
- Edition: Fermín Aldeguer 2025 Replica
- Shell material: Carbon 6K
- Weight: approx. 1,280 g ± 50 g
- Certification: ECE 22.06
- Visor: Class A polycarbonate, anti-scratch, UV protection, Pinlock 120 Max Vision ready
- Retention: Double-D-ring with reinforced strap
- Liner: removable, washable, antibacterial
- Intended use: road and track
| Brand | LS2 |
|---|---|
| Model | FF805 Thunder GP Aero |
| Edition | Fermín Aldeguer 2025 Replica |
| Shell material | Carbon 6K |
| Weight | approx. 1,280 g ± 50 g |
| Certification | ECE 22.06 |
| Visor standard | Class A polycarbonate, anti-scratch, UV protection, Pinlock 120 Max Vision ready |
| Retention system | Double-D-ring with reinforced strap |
| Intended use | Road and track |
Fitment data coming soon.
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// LS2
LS2 FF805 Thunder Carbon Helmet — Fermín Aldeguer 2025 Replica
Tech specs
- Brand
- LS2
- Model
- FF805 Thunder GP Aero
- Edition
- Fermín Aldeguer 2025 Replica
- Shell material
- Carbon 6K
- Weight
- approx. 1,280 g ± 50 g
- Certification
- ECE 22.06
- Visor standard
- Class A polycarbonate, anti-scratch, UV protection, Pinlock 120 Max Vision ready
- Retention system
- Double-D-ring with reinforced strap
- Intended use
- Road and track
// Support
Frequently asked questions
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