Here's a great half-zip top from Obermeyer.

Tagged size M
Measured flat:
Armpit to armpit 22.5"
Collar to bottom 26.5"
Center of collar to cuff 35"

Customer satisfaction is always guaranteed. International Buyers – Please Note: Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying. Customs fees are normally charged by the shipping company or collected when you pick the item up. These fees are not additional shipping charges. We won't under-value merchandise or mark the item as a gift on customs forms. Doing that is against U.S. and international laws.