Abstract: An article of footwear with an undulating sole provides a different and unique ride and/or feel to the article of footwear while also providing adequate cushioning and support to an article of footwear. The sole has an undulating shape that may be substantially similar to a sine wave with a series of alternating peaks and troughs.

Abstract: An article of footwear with an undulating sole provides a different and unique ride and/or feel to the article of footwear, while also providing a unique aesthetic appeal and adequate cushioning and support. The midsole has an undulating shape substantially similar to a sine wave with a series of alternating peaks and troughs.

Abstract: An article of footwear with an inflatable system may have a valve incorporated therein to adjust the level of cushioning in the article of footwear. The valve may be in communication with an inflatable bladder and may have a body, a piston, and an interface. The body may have an interior chamber, a fluid inlet, and a fluid outlet. The piston may be located within the interior of the body and can be spring actuated. The interface may be connected to the body such that movement of the interface between a first position and a second position results in the piston moving between a first position wherein fluid is permitted to enter the interior chamber at a first rate and a second position wherein fluid is permitted to enter at a second rate, wherein the first rate is greater than the second rate.

Abstract: An article of footwear with an undulating sole provides cushioning and support to an article of footwear. The sole has an undulating shape that may be substantially similar to a sine wave with a series of alternating peaks and troughs.

Abstract: An article of footwear with an undulating sole provides a different and unique ride and/or feel to the article of footwear, while also providing a unique aesthetic appeal and adequate cushioning and support. The midsole has an undulating shape substantially similar to a sine wave with a series alternating peaks and troughs.

Abstract: An article of footwear with an inflatable system may have a valve incorporated therein to adjust the level of cushioning in the article of footwear. The valve may be in communication with an inflatable bladder and may have a body, a piston, and an interface. The body may have an interior chamber, a fluid inlet, and a fluid outlet. The piston may be located within the interior of the body and can be spring actuated. The interface may be connected to the body such that movement of the interface between a first position and a second position results in the piston moving between a first position wherein fluid is permitted to enter the interior chamber at a first rate and a second position wherein fluid is permitted to enter at a second rate, wherein the first rate is greater than the second rate.