A hardshell is a fully waterproof, windproof outer jacket built to keep rain and snow out in serious weather, typically using a membrane like Gore-Tex with taped seams. Hardshells are tough and protective but less breathable and stretchy than softshells, making them the go-to for storms, alpine climbing, and wet conditions.
A shell is the outer layer of a clothing system, worn over insulation to block wind and rain. Shells range from waterproof hardshells for storms to breathable softshells for active use in dry, windy conditions. The shell protects the warm, dry layers beneath from the elements.
A mid layer is the insulating middle layer in a clothing system, worn over the base layer to trap warmth. Common mid layers include fleece, down, and synthetic-insulated jackets. You add or remove the mid layer to regulate temperature, making it the adjustable 'thermostat' of the layering system.
A base layer is the innermost clothing layer worn against the skin, designed to wick sweat away and keep you dry within the layering system. Made from merino wool or synthetics (not cotton), base layers regulate temperature and moisture; a dry base layer is the foundation of staying warm and comfortable outdoors.
A backpack is a fabric pack worn on the back to carry gear, with shoulder straps and usually a hip belt and frame to transfer load to the hips. Outdoor backpacks range from small daypacks to large multi-day packs measured in liters, and a good fit — load on the hips, not the shoulders — is the key to comfort.
Trail running shoes are lightweight, flexible shoes with aggressive lugged outsoles for grip on dirt, rock, and mud. Originally for running, they are now widely used by hikers and backpackers for fast, light travel. They prioritize low weight and breathability over the support and durability of hiking boots.
Hiking shoes are low-cut, lightweight versions of hiking boots, offering grippy soles and trail protection without the higher ankle support. They suit day hikes and lighter loads on moderate terrain, splitting the difference between heavy boots and trail-running shoes for hikers who want some support but less weight.
Hiking boots are sturdy, supportive footwear with grippy lugged soles and higher ankle support, built for carrying loads over rough, uneven trails. They offer durability, protection, and stability — especially with a heavy pack — at the cost of weight compared with trail-running shoes, which many hikers now prefer for lighter, faster travel.
Base camp is the main, established camp at the foot of a mountain or expedition objective, serving as the hub for the climb. Stocked with supplies, tents, and often communications and medical support, base camp is where climbers rest, acclimatize, and stage their pushes to higher camps and the summit.
The rest step is an energy-saving uphill walking technique for steep snow and altitude, where you briefly lock the trailing leg straight and pause on the skeleton between each step, letting the muscles rest for a moment. Combined with rhythmic pressure breathing, it lets mountaineers move steadily for hours without exhausting their legs.