Expect a weather swing from warm and dry to cold and wet in hours on the Tour du Mont Blanc. You’ll hike 5–10 hours a day with big altitude gains, so layers matter. Start with a waterproof shell jacket and trousers (GORE-TEX or equivalent), plus a down or synthetic insulated jacket for evenings. Underneath, wear moisture-wicking base-layer tees and leggings, then a mid-layer fleece. Throw in a cotton T-shirt for hut downtime. For bottoms, pack trekking trousers or leggings that move with you, and shorts for hotter days. On the head, you need both a sun hat and a warm beanie, plus a buff for wind protection. Footwear options include broken-in hiking boots for ankle support or lighter trail shoes if you’re confident. Merino-wool socks and optional flip-flops for huts or showers round out the list. Aim for a 30–35 L backpack with a rain cover and waist strap. Trekking poles save your knees on steep sections. Carry two 1.5–2 L water bottles, snacks (bars, gels, nuts, chocolate), a headlamp with spare batteries, sunscreen SPF 50+, lip balm SPF 30+, and a basic first-aid kit. Stow passport and insurance copies, cash or card, toiletries, earplugs, travel towel, pen knife, zip-lock bags, and a phone plus power bank. If you hit snow early or late in the season, add microspikes, gaiters, and thermal base layers. For comfort in refuges, bring a sleeping-bag liner and pillowcase. Luggage tags help if you use a transfer service. Pack light but cover these essentials to stay safe, dry, and comfortable on each stage of the trek.