Abstract: Retention members for an in-ear headphone include a base portion and a substantially straight flexible finger extending from the base portion. Absent external forces, the flexible finger includes a substantially straight longitudinal axis and a back surface extending from a proximal end portion to a distal end portion and having a plurality of recesses along a length of the back surface. The flexible finger is configured to, during use, bend into a curved shape for disposition under a user's antihelix. In-ear headphones include a shell defining a volume housing an audio driver, a nozzle extending from the shell configured for at least partial insertion into an ear canal, and a flexible retention member coupled to the shell, the flexible finger including a substantially straight longitudinal axis, a back surface, and a concave front surface.

Abstract: Retention members for an in-ear headphone include a base portion and a substantially straight flexible finger extending from the base portion. Absent external forces, the flexible finger includes a substantially straight longitudinal axis and a back surface extending from a proximal end portion to a distal end portion and having a plurality of recesses along a length of the back surface. The flexible finger is configured to, during use, bend into a curved shape for disposition under a user's antihelix. In-ear headphones include a shell defining a volume housing an audio driver, a nozzle extending from the shell configured for at least partial insertion into an ear canal, and a flexible retention member coupled to the shell, the flexible finger including a substantially straight longitudinal axis, a back surface, and a concave front surface.

Abstract: Accessory structures for connection to straps of user-wearable accessories include a module, a first strap engagement structure disposed on a first side of the module, and a second strap engagement structure disposed on a second side of the module. The module may comprise at least one of an integral accessory device and an attachment feature configured for attachment to a separate accessory device. The strap engagement structures are configured for connection to straps of a user-wearable accessory. User-wearable accessory systems include such an accessory structure and a user-wearable accessory to which the accessory structure may be connected. Methods include the formation of such an accessory structure. Additional methods include the connection of such an accessory structure to a user-wearable accessory.

Abstract: In one example, an apparatus for teaching a student to ski or snowboard includes a removably attachable instructor component and a removably attachable student component. The instructor component has a first end and a second end. The first end defines a cavity configured to receive a bottom end of an instructor's ski pole. The first end is configured to be removably secured to the bottom end of the instructor's ski pole. The second end is disposed opposite the first end. The student component is configured to be removably secured to a student's ski or snowboard equipment and is also configured to be removably secured to the second end of the instructor component.