The undulating pint glass with the smaller grip does what many bartenders once thought impossible: It holds the foam.

"I thought this couldn't be done," says Bernie Reilly, owner of The Perfect Pint in Midtown, one of a few New York bars now carrying the new glasses, which have been made available to about a thousand pubs around the country since May.

"The way the beer doesn't go flat and the way the head stays on the beer is amazing."