British Army Mk7 Helmet Goarmy British Army Mk7 Helmet Goarmy British Army Mk7 Helmet Goarmy British Helmet MK7 Surplus and Outdoors British Mk7 helmet everything you need to know Page 6. Authentic Tactical Military Training helmet: Experience the authenticity of military training with the Original British Military Black Plastic Helmet MK7. Crafted to meet military standards, this helmet is designed for tactical training, offering reliable protection and functionality. Adjustable Size (52 64cm): Achieve a customized fit with the adjustable sizing feature. The helmet is designed to accommodate head sizes ranging from 52 to 64 centimeters, ensuring a secure and comfortable fit for a wide range of users. Chinstrap for Secure Fit: Maintain a secure and stable fit during training sessions with the included chinstrap. The chinstrap is a crucial component, preventing the helmet from shifting during movement and ensuring optimal protection. All Season Design: Versatility meets practicality with this all season helmet. Whether used in hot summer training or cooler winter exercises, the design accommodates various weather conditions, making it suitable for year round use. Durable Plastic Construction: Built to withstand the demands of training, the helmet features a durable plastic construction. The robust material ensures longevity and resilience, making it suitable for rigorous use in tactical scenarios. Compact and Lightweight: Experience the convenience of a compact and lightweight design. The helmet's construction prioritizes ease of movement without compromising on protective features, making it suitable for dynamic training scenarios.