The LockDown™ Liner System enhances comfort, stability, and airflow in FAST helmets, making it ideal for heavy VAS and NVG setups. Featuring a universal impact and comfort liner system, Cable Occ-Dial with a conformal nape pad, and LockDown Fit shims, it ensures a secure, tailored fit for any head shape. The Head-Loc FLEX retention system adds adaptability with a convertible chin cup that can be worn under or over the chin for personalized comfort and stability. Built for demanding conditions, the LockDown Liner Kit delivers unmatched performance and security when it matters most. KIT INCLUDES: Form Fitted Foam Insert Pads Chinstrap System with OCC Dial Hardware must be purchased separately FEATURES: One-size-fits-all tailored liner system built upon comfort and airflow. Strategically placed pads to maximize airflow through the helmet. Moisture-wicking fabric and reticulated foam-lightweight, drives quickly, and anti-microbial. Pad orientation and placement accommodate over-the-ear hearing protection, with no hot spots. Super-conformable nape pad (back of the neck) and cable Occ-Dial® system to tighten. This provides more surface area contact for an improved fit, particularly under the weight of NVGs.