I love my Julbos! The Tamang glasses were the most affordable option for someone on a budget headed to the Himalayas. They are rated on a scale of 1-4 based on UV protection at altitude on snow and these are a category 4 which is the highest rating! They have visor protection at the rim by your cheeks to keep snow glare from coming up from underneath and they are SUPER COMFY! They work great at any altitude with snow. HIGHLY recommend!