A user device (100) is provided. The user device is a footwear device (100a), a medical device (100b), a mattress device (100c), or a seat cushion (100d), and is shaped to define a plurality of chambers (28). Apparatus for use with the user device includes circuitry (34, 152) and a pump (38, 130). The circuitry includes at least one device pressure sensor (36) that measures pressure in the chambers. The pump is couplable to the user device by a user 18, and the circuitry actuates the pump to selectively inflate or deflate the plurality of chambers to at least two different respective pressures. The pump is decouplable from the user device without the decoupling affecting the respective pressures in the chambers. Other applications are also described.

Foot support systems, e.g., for articles of footwear, include systems for changing the hardness or firmness of the foot support portion (e.g., of a sole structure) and/or systems for moving (e.g., selectively moving) fluid between various portions of the foot support system. Such systems may include: a foot support bladder, a pump, and a fluid reservoir. Two or more fluid transfer lines may be provided to connect these components, and these fluid lines are equipped with fluid flow control device(s) and/or check valves to enable selective movement of fluid between the fluid reservoir and the foot support bladder. Such systems enable one to set and maintain two or more foot support pressures in the foot support bladder.

A one-way air inlet member, cushion airbag pad and manufacture method thereof. The one-way air inlet member configured for mounting on a cushion airbag pad, wherein external gas enters the cushion airbag pad through the one-way air inlet member, but the one-way air inlet member prevents the gas in the cushion airbag pad from flowing out to outside. By means of a simple one-way air inlet member, the slow gas leakage can be prevented, thereby effectively preventing the air leakage of the cushion airbag pad, the slow gas leakage can be prevented, thereby effectively preventing the air leakage of the cushion airbag pad, and thus no need to be frequently inflated, convenient to use.

A footwear device is provided, the footwear device defining a plurality of chambers and including a resilient base on which the plurality of chambers are disposed. In the absence of any forces applied to the resilient base, a height of an upper surface of the resilient base under a first one of the chambers is higher than a height of the upper surface of the resilient base under a second one of the chambers. Other applications are also described.