Eyewear apparatus includes dry electrophysiological electrodes and, optionally, other physiological and/or environmental sensors to measure signals such as EOG and ECG from the head of a subject. Methods of use of such apparatus to provide fitness, health, or other measured or derived, estimated, or predicted metrics are also disclosed.

A protective head cover having selectable size and location of at least one opening for exposure of a portion of a user's hair to an external hair treatment environment. An impermeable outer surface of the protective head cover protects hair thereunder from an external hair treatment environment. A main opening receives a user's head inserted into the protective head cover. An opening on the protective head cover, separate from the main opening, has an opening size that is selectable from a plurality of selectable sizes and an opening location that is selectable from a plurality of selectable locations.

A protective head cover having selectable size and location of at least one opening for exposure of a portion of a user's hair to an external hair treatment environment. An impermeable outer surface of the protective head cover protects hair thereunder from an external hair treatment environment. A main opening receives a user's head inserted into the protective head cover. An opening on the protective head cover, separate from the main opening, has an opening size that is selectable from a plurality of selectable sizes and an opening location that is selectable from a plurality of selectable locations.

A swimming cap made of a synthetic rubber and sized to substantially cover the scalp of a wearer's head, the cap having an opening formed in a posterior region thereof such that the wearer's hair can pass through the opening to form a ponytail.

A swimming cap made of a synthetic rubber and sized to substantially cover the scalp of a wearer's head, the cap having an opening formed in a posterior region thereof such that the wearer's hair can pass through the opening to form a ponytail.

A swim cap for persons having long hair includes a shell preferably having at least two interconnected compartments for receiving and encapsulating the hair of a user. The swim cap is secured around the head of a user by at least one draw string or adjustable band positioned within a channel near the open end of the swim cap as well as a chin strap extending downwardly from the cap. The interconnected compartments can be inflated to provide buoyancy. The shell further includes an outer layer and an inner layer defining a space therebetween that can also be inflated, or comprised of buoyant material, to provide buoyancy. A pump, compressed air canister or manual filler tube in communication with the interconnected compartments or space within the shell can be used to provide inflation. A pair of ear flaps extends downwardly from the swim cap around a user's head.

A swim cap for persons having long hair includes a shell preferably having at least two interconnected compartments for receiving and encapsulating the hair of a user. The swim cap is secured around the head of a user by at least one draw string or adjustable band positioned within a channel near the open end of the swim cap as well as a chin strap extending downwardly from the cap. The interconnected compartments can be inflated to provide buoyancy. The shell further includes an outer layer and an inner layer defining a space therebetween that can also be inflated, or comprised of buoyant material, to provide buoyancy. A pump, compressed air canister or manual filler tube in communication with the interconnected compartments or space within the shell can be used to provide inflation. A pair of ear flaps extends downwardly from the swim cap around a user's head.

A hair wrap envelopes the hair. The hair wrap comprises a cap portion, a pouch, and side walls. The cap portion has at least one attachment means. At least two elongated ties located on opposite sides of the side walls are adapted to be twisted for securing the wrap on the user's head. A material loop is located on a back base of the pouch to hold the ties in place. An attachment means located on a bottom edge of the pouch mates with the attachment means of the cap portion. A crown material loop located on the top section is adapted to hold the pouch after the pouch is twisted and lifted toward the top section. The pouch is adapted to be worn in a variety of styles, including to lay untwisted when the wrap is in an extended position, and twisted and lifted upward when the wrap is in a wrapped position.

A hair wrap envelopes the hair. The hair wrap comprises a cap portion, a pouch, and side walls. The cap portion has at least one attachment means. At least two elongated ties located on opposite sides of the side walls are adapted to be twisted for securing the wrap on the user's head. A material loop is located on a back base of the pouch to hold the ties in place. An attachment means located on a bottom edge of the pouch mates with the attachment means of the cap portion. A crown material loop located on the top section is adapted to hold the pouch after the pouch is twisted and lifted toward the top section. The pouch is adapted to be worn in a variety of styles, including to lay untwisted when the wrap is in an extended position, and twisted and lifted upward when the wrap is in a wrapped position.

Earphone apparatus includes dry electrophysiological electrodes and, optionally, other physiological and/or environmental sensors to measure signals such as ECG from the head of a subject. Methods of use of such apparatus to provide fitness, health, or other measured or derived, estimated, or predicted metrics are also disclosed.