Abstract: A structure (2) and a removable component (10) for an article of footwear are disclosed. A structure comprises an outsole component (3) comprising resiliently deflecting diaphragm elements (6) for generation of pumping action for forcing air towards the removable component placed in a holding recess (7). The removable component comprises cavities (11) facing the outsole component and arranged to receive air from the resiliently deflecting diaphragm elements, air circulation channels (12) extending substantially laterally from the cavities for distributing air from the cavities to the air circulation channels, and sealing areas adjacent to the cavities and air circulation channels. The sealing areas are arranged to prevent air from escaping the cavities and air circulation channels when the removable component is inserted in the holding recess. Air circulation channels (12) may be provided with expanded areas (16). The expanded areas may have varying shapes and number of perforations.

Abstract: Marine craft has a crushable frontal impact protection structure, comprising transverse bulkhead protecting passenger area; longitudinal crushable tubes; and transverse member. Webs strengthen tubes, which may be made of extruded, heat treated aluminum; stainless steel; or plastic. Tubes are splayed to improve protection against angled impacts. The forward ends of tubes are tapered to initiate deformation. Tubes may be hexagonal, round, or oval in cross-section. Longitudinal bulkheads, and a transverse bulkhead may be used in place of tubes. Longitudinal corrugated sheets may be mounted transversely. The bow area may be filled with deformable cellular foam to act as a buoyancy aid. Side and rear impact protection is also provided.