Abstract: The ventilated footwear comprises a lower part incorporating a sole, an upper part coupled to the lower part and shaped to receive a foot of a wearer. The upper part has an arch portion and is provided with an inside surface adapted to permit air circulation therethrough, and an outside surface provided with ventilation holes located in the arch portion of the upper part of the footwear. A waterproof and breathable membrane is sandwiched between the inside and outside surfaces in the arch portion of the upper part of the footwear across the holes. Furthermore, an insole is preferably disposed into the footwear. The insole has an arch portion adjacently located to the arch portion of the upper part of the footwear. The upper layer of the insole is adapted to permit air circulation therethrough. The insole has a bottom layer provided with transverse intersecting channels extending inwardly from a peripheral edge of the insole.

Abstract: A process is described for the production of hydrocarbons with a high octane number starting from hydrocarbon cuts containing isobutene by means of selective dimerization with acid catalysts, characterized in that the dimerization reaction is carried out in a tubular reactor using a feeding containing isobutene in quantities of less than 20% by weight and with a molar ratio linear olefins/isobutene greater than 3, preferably operating at a reaction temperature ranging from 30 to 120° C., at a pressure of less than 5 MPa and at feeding space velocities of less than 60 h−1.

Abstract: The ventilated footwear comprises a lower part incorporating a sole, an upper part coupled to the lower part and shaped to receive a foot of a wearer. The upper part has an arch portion and is provided with an inside surface adapted to permit air circulation therethrough, and an outside surface provided with ventilation holes located in the arch portion of the upper part of the footwear. A waterproof and breathable membrane is sandwiched between the inside and outside surfaces in the arch portion of the upper part of the footwear across the holes. Furthermore, an insole is preferably disposed into the footwear. The insole has an arch portion adjacently located to the arch portion of the upper part of the footwear. The upper layer of the insole is adapted to permit air circulation therethrough. The insole has a bottom layer provided with transverse intersecting channels extending inwardly from a peripheral edge of the insole.

Abstract: The ventilated footwear comprises a lower part incorporating a sole, an upper part coupled to the lower part and shaped to receive a foot of a wearer. The upper part has an arch portion and is provided with an inside surface adapted to permit air circulation therethrough, and an outside surface provided with ventilation holes located in the arch portion of the upper part of the footwear. A waterproof and breathable membrane is sandwiched between the inside and outside surfaces in the arch portion of the upper part of the footwear across the holes. Furthermore, an insole is preferably disposed into the footwear. The insole has an arch portion adjacently located to the arch portion of the upper part of the footwear. The upper layer of the insole is adapted to permit air circulation therethrough. The insole has a bottom layer provided with transverse intersecting channels extending inwardly from a peripheral edge of the insole.