The Rapide SL is an ultralight inflatable pillow weighing about 45 g, built with an offset I-beam construction to help it hold shape rather than flatten unevenly under your head. A micro-adjust valve lets you dial in firmness by letting small amounts of air in or out rather than a single all-or-nothing inflate.
At 45 g it's built for hikers who weigh every gram, such as thru-hikers and fastpackers, without giving up the shape-holding I-beam structure or the fine firmness control of the micro-adjust valve. What you trade for that low weight is the extra surface area and cushioning a heavier, more padded pillow offers, so anyone wanting a plusher feel should look at a bulkier option instead.