前后硬壳防护罩采用高性能聚乙烯材料混合而成，可实现最佳的柔韧性和出色的重量节省。外壳经过认证：
- 前壳体符合EN 14021（石盾）
- 背部保护器根据EN 1621_2:2014 1级认证。
- 外壳采用穿孔设计，实现最佳透气性和冷却通风效果，非常适合炎热多尘的赛道骑行。
- 可调式腰身弹力带结合热成型穿孔罗纹保护面板，在不影响运动的情况下提供高度保护。
- 肾脏闭合系统具有全新设计、快速且易于使用的扣环。新的防护罩闭合意味着一种尺寸适合多种骑手体型。
- 柔软的生物泡沫衬垫底盘，优化舒适度，贴近身体。
- 模块化设计意味着A-4针对BNS颈部支架进行了优化：
- 可拆卸上背部衬垫面板，可兼容BNS颈部支撑。
- 软触式BNS拉出器，方便安全地接合BNS。
- 可拆卸和可调节的肩垫，可通过集成的BNS拉具调节尺寸。
- 额外的热成型EVA故事延伸，以扩大覆盖到尾骨区域。
- 有国际尺码XS/S–M/L–XL/XXL
Front and back hard shell guards constructed from a performance poly-material blend for optimized flexibility and excellent weight saving. Shells are certified:
- Front shell certified against EN 14021 (stone shield)
- Back protector certified according with the EN 1621_2: 2014 level 1.
- Shells are perforated for maximum breathability and cooling ventilation, perfect for those hot dusty track rides.
- Adjustable kidney elastic strap incorporates thermoformed perforated rib protection panels for high levels of protection without compromising movement.
- Kidney closure system has newly designed, quick and easy-to-use buckles. New guard closure means one size fits a broad range of rider body types.
- Soft bio-foam padded chassis for optimized levels of comfort and close-to-the-body fit.
- Modular design means A-4 is optimized for use with BNS neck braces:
- Removable upper back padded panel for BNS neck support compatibility.
- Soft touch BNS puller for easy and safe engagement of the BNS.
- Removable and adjustable shoulder pads for size regulation with integrated BNS puller.
- Additional thermoformed EVA tale extension for extended coverage to the coccyx area.
- Comes in international sizes XS/S –M/L – XL/XXL
