An adjustable helmet having first and second shells and a single actuator comprising at least one tooth, the single actuator being moveable between: a first locked position, wherein the at least one tooth retains the first and second shells and the first and second shells define a first hollow space; a released position, wherein the at least one tooth no longer retains the first and second shells such that one of the first and second shells is moveable relative to the other of the first and second shells; and a second locked position, wherein the at least one tooth retains the first and second shells and the first and second shells define a second hollow space, the second hollow space being different than the first hollow space.

A motorcycle helmet providing cool and cleaning air may comprise a helmet body, having a window opening and a wearing opening, wherein two sides of the window opening pivotally connect to a goggle; the goggle can pivot to the window opening and seals it; the wearing opening is installed a first connecting device around; there is a ventilation hole on an opening position on the helmet body or the goggle; an ventilation tube with one end connected to the ventilation hole; a PAPR-typed air supplier connected to the other end of the ventilation tube, for providing external air which has been screened to remove particulate matters to the helmet body through the ventilation tube; and a guiding towel made of wind-proof materials, wherein a top end of the guiding towel has a second connecting device and the second connecting device is removably connected to the first connecting device.

A motorcycle helmet providing cool and cleaning air may comprise a helmet body, having a window opening and a wearing opening, wherein two sides of the window opening pivotally connect to a goggle; the goggle can pivot to the window opening and seals it; the wearing opening is installed a first connecting device around; there is a ventilation hole on an opening position on the helmet body or the goggle; an ventilation tube with one end connected to the ventilation hole; a PAPR-typed air supplier connected to the other end of the ventilation tube, for providing external air which has been screened to remove particulate matters to the helmet body through the ventilation tube; and a guiding towel made of wind-proof materials, wherein a top end of the guiding towel has a second connecting device and the second connecting device is removably connected to the first connecting device.

The present disclosure can be embodied by a detachable assembly, for example a helmet and headphone assembly. A locking assembly can be configured to removably attach the headphones to the helmet in a locked position. In the locked position, the headphones can be locked horizontally onto the helmet, and a portion of ear cups of the headphones may be received at least partially through a pair of ear cup receiving apertures that extend through a shell of the helmet.

The present disclosure can be embodied by a detachable assembly, for example a helmet and headphone assembly. A locking assembly can be configured to removably attach the headphones to the helmet in a locked position. In the locked position, the headphones can be locked horizontally onto the helmet, and a portion of ear cups of the headphones may be received at least partially through a pair of ear cup receiving apertures that extend through a shell of the helmet.

In some examples, a system includes a head-mounted device, a visor that includes a reflective object that is substantially transparent in a visible light spectrum and embodied at a physical surface of the visor, at least one visor attachment assembly that couples the visor to the head-mounted device; at least one optical sensor; and at least one computing device communicatively coupled to the at least one optical sensor, the at least one computing device comprising a memory and one or more computer processors that: receive, from the optical sensor, an indication of light outside of a visible light spectrum that is reflected from the reflective object; determine, based at least in part on the light outside of a visible light spectrum that is reflected from the reflective object, a position of the visor; and perform, based at least in part on the position of the visor, at least one operation.

Disclosed herein is a headwear for releasably securing an ear gear to a user's head.

Disclosed herein is a headwear for releasably securing an ear gear to a user's head.

Provided is a protective headgear that includes a first shell section, second shell section, third shell section, and fourth shell section. The first shell section is configured to extend about a head of the user, and include a first central portion, a first strap and a second strap that extend from the first shell section. The first central portion includes a first protective layer and a second protective layer disposed atop the first protective layer. The second shell section is configured to extend about a jaw of the user, and include a second central portion, a third strap and a fourth strap that extend from the second shell section. The third shell section is connected to the first shell section by the first strap and the third strap, and the fourth shell section is connected to the second shell section by the second strap and the fourth strap.

The present disclosure can be embodied by a detachable assembly, for example a helmet and headphone assembly. A locking assembly can be configured to removably attach the headphones to the helmet in a locked position. In the locked position, the headphones can be locked horizontally onto the helmet, and a portion of ear cups of the headphones may be received at least partially through a pair of ear cup receiving apertures that extend through a shell of the helmet.