What equipment do adult players have to wear?

Required for adult skaters:

• A hockey helmet with the chin strap properly fastened. It doesn't need to be HECC-certified for adults.
• Hockey skates.

Not required for adult skaters by USA Hockey rules (but recommended):

• Facemask. A HECC full facemask is required only below the Adult classification. USA Hockey strongly recommends that all players wear a HECC-certified helmet and full facemask.
• Mouthguard. Required only from 12U through 18U/19U.
• Neck laceration protector. Strongly recommended for adults (HECC-certified), along with cut-resistant socks, sleeves or undergarments.

Goalies must wear a helmet and full facemask at every level.

Also:

• You're personally responsible for wearing gloves, shin pads, shoulder and elbow pads, padded pants or hip pads, a protective cup and tendon pads. All but gloves, pants, helmet and goalie leg pads go under the uniform.
• Wear your helmet on the bench and in the penalty box.
• If your helmet comes off during play, play is stopped and you must leave the ice until the next face-off is completed.
• The jewelry ban doesn't apply to adults.