Sunscreen use is important for all seasons. The winter months may be times of significant UV exposure. For individuals heading to the mountains, the increased altitude reduces the amount of atmosphere that would normally absorb UV radiation. For this reason, individuals at altitude have a higher exposure to UV radiation and increase their risk of sunburn. For those going to snow covered areas, snow reflects UV radiation and increases UV exposure up to an additional 20%. While it is not as hot during the winter, there is sufficient UV radiation to cause burns if your skin is not protected