It can get quite freezing in the glacier, even in the height of summer. Make sure you dress warmly and in layers. We always recommend thermal underclothes, water-repellent footwear and windproof outerwear. We will provide crampons for use inside the tunnel. On sunny days, you may wish to bring sunscreen or a hat to protect against sunburn. As the sunlight can get severe reflected on the snow and ice, be sure to wear sunglasses also!We also recommend that you bring a snack and, of course, your camera to capture the memory!