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The Seirus Heatwave Thick N Thin Headliner delivers amplified warmth with a smart hybrid design that pairs a thin, 4‑way stretch Heatwave hood with a thick, 200wt technical fleece neck warmer. The Heatwave thermodynamic lining reflects and amplifies your natural heat, transforming a lightweight headliner into a powerful cold‑weather layer. A thin Heatwave balaclava provides kinetic and reflective warmth, while the Polartec® fleece neck‑up adds extra insulation where you need it most. Flat‑seam construction ensures a smooth, helmet‑friendly fit, and the 4‑in‑1 versatility adapts easily to changing winter conditions.
Because you want maximum warmth without extra bulk. The Heatwave Thick N Thin combines reflective Heatwave technology with Polartec® fleece insulation in a flexible 4‑in‑1 design that fits comfortably under helmets or hats.


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