Classic Category 4 glacier sunglasses featuring a vintage round silhouette, genuine leather side shields, a removable centerpiece, shatterproof lenses, and full-mirror coating. Lightweight and highly durable Heron Glacier sunglasses are equipped for unmatched eye protection in extreme alpine conditions and high-altitude environments. Designed for mountaineers, glacier travellers, and ski tourers, they block intense alpine sunlight, glare from snow, and harsh mountain wind. For a polarized version, check out Heron Ocean or Heron Desert.