He wore a helmet and a mask, sunglasses and black, white and yellow gloves when he entered a store Wednesday night in Hewlett, lifting his sweatshirt to reveal a gun — and signal he was robbing the place, Nassau County police said.

Police are asking for the public’s help locating the suspect who robbed The Barn store on Broadway at 9:40 p.m.

Police said the suspect entered the store, lifted his sweatshirt “exposing the gun to the female employee,” then took cash from the register — and drove away on a black and white motorcycle.

Police said he was last seen on Peninsula Boulevard, headed toward Woodmere.

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No one was injured in the robbery.

Police ask anyone with information to call Crime Stoppers at 800-244-8477. All calls will remain confidential.