GMax · AT-21S · GMax AT-21S
GMax AT-21S Gloss Black
Design Concept & Background
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GMax AT-21S Gloss Black is a high-performance Adventure/Dual Sport helmet engineered by GMax to meet high standards of safety and comfort. Inspect its detailed design background and specifications below.
Key Highlights:
Rider Profile & Intended Use
Where to buy
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Amazon (US)
Store Profile
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$149.95 | ● In Stock | 1 second ago | Buy Now → |
Certified GMax Stores in US
Price History
Product Concept & Specifications
GMax (United States)Engineering & Technical Analysis
The GMax AT-21S features a polycarbonate shell for lightweight durability and an intermediate oval fit for a secure, comfortable feel. Its adventure-ready design includes adjustable ventilation to manage airflow, while the dual-sport construction balances off-road protection with on-road practicality. The helmet incorporates safety tech like reinforced impact absorption and a moisture-wicking interior for long-ride comfort.
Fit & Shell Structure
Intermediate Oval Shape
Balanced oval fit: standard ergonomic curvature fitting 80%+ of riders.
Safety & Certifications
Acoustics & Aerodynamics
Quiet Index: Superior sound damping and isolated ear cavity structures. Good flow balance utilizing EPS exhaust ports.
Technology & Convenience
Interactive Size & Fit Finder
How to measure
Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, and repeat for consistency.
Available Colors & Graphics
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