Disclosed is a waterproof shoe with an improved ventilation mechanism, designed to circulate air from the outside environment through the shoe in order to provide convective cooling to a wearer's foot. In a desired embodiment, the shoe may incorporate a pump-ventilation mechanism which, coupled with airflow channels incorporated in the upper, acts to establish continuous substantially one-way airflow through the shoe in a heel-to-toe direction while a user walks.

Disclosed is a waterproof shoe with an improved ventilation mechanism, designed to circulate air from the outside environment through the shoe in order to provide convective cooling to a wearer's foot. In a desired embodiment, the shoe may incorporate a pump-ventilation mechanism which, coupled with airflow channels incorporated in the upper, acts to establish continuous substantially one-way airflow through the shoe in a heel-to-toe direction while a user walks.

A multi-layered orthopedic insole has at least four layers. The first layer is leather, the second layer is molded high-density recycled latex foam, the third layer is a molded, rigid density cork-EVA (Ethylene-Vinyl Acetate) footbed, and the fourth or bottom layer is moleskin or moleskin coated to provide a natural grip for gripping a shoe insole. The different layers are fused to form the orthopedic insole of the present invention. The third layer of the multi-layered insole is generally thicker than the other layers and includes sidewalls covered in a leather wrap. The multi-layered orthopedic insole is specifically designed to provide comfort and support to a user's foot using the specified materials, shapes, and contours.

A multi-layered orthopedic insole has at least four layers. The first layer is leather, the second layer is molded high-density recycled latex foam, the third layer is a molded, rigid density cork-EVA (Ethylene-Vinyl Acetate) footbed, and the fourth or bottom layer is moleskin or moleskin coated to provide a natural grip for gripping a shoe insole. The different layers are fused to form the orthopedic insole of the present invention. The third layer of the multi-layered insole is generally thicker than the other layers and includes sidewalls covered in a leather wrap. The multi-layered orthopedic insole is specifically designed to provide comfort and support to a user's foot using the specified materials, shapes, and contours.

A method of making an orthotic is disclosed. The method includes the steps of taking measurements relating to a foot and then creating a digital representation of an orthotic on a display device based on said measurements. This digital representation of the orthotic having a heel portion for supporting a heel of a person and a distal portion located in front of the heel portion which can be divided into first and second distal portions. The thickness of the digital representation of the first and second distal portions is then varied such that one of the distal portions is thicker than the other. Finally, an additive manufacturing technique, using a substantially uniform material or materials, is used to create a physical version of the digital representation of the orthotic.

A method of making an orthotic is disclosed. The method includes the steps of taking measurements relating to a foot and then creating a digital representation of an orthotic on a display device based on said measurements. This digital representation of the orthotic having a heel portion for supporting a heel of a person and a distal portion located in front of the heel portion which can be divided into first and second distal portions. The thickness of the digital representation of the first and second distal portions is then varied such that one of the distal portions is thicker than the other. Finally, an additive manufacturing technique, using a substantially uniform material or materials, is used to create a physical version of the digital representation of the orthotic.

A shoe component includes a base structure which is substantially shaped so as to reproduce at least partially the sole of a foot of a user, the base structure having an upper surface which is designed to be directed toward the foot and a lower surface which is opposite the upper surface, the component comprising one or more through holes and one or more blind holes provided in the base structure. The one or more through holes are in communication with one or more of the one or more blind holes through one or more channels provided in the base structure.

An insole for a shoe can include a top surface, an opposing bottom surface, a rear end and an opposing front end. At least a section of the top surface proximate the rear end can be concave. At least a section of the bottom surface proximate the rear end can be convex. A plurality of spaced-apart holes can extend through the insole from the top surface to the bottom surface. The plurality of spaced-apart holes can be arranged in two rows. A first row of the two rows can be spaced radially inward with respect to a second row of the two rows. Each of the plurality of holes of the first row can have the same size. Each of the plurality of holes of the second row can have the same size.

Methods for fracturing a subterranean formation penetrated by a well bore are provided, the method comprising the step of injecting a well treatment fluid into the well bore at a pressure and flow rate sufficient to fracture the subterranean formation, wherein the well treatment fluid comprises one or more iron-containing compounds and one or more booster compounds. The methods can be used to reduce viscosity and to facilitate the decomposition of acrylamide-containing polymers.