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: Mailings must consist of at least 200 pieces (or 50 pounds) but no more than 5,000 pieces per day per 5-digit ZIP Code.

: More than 1/4 inch but not more than 3/4 inch thick.

: It is a thermoregulating, mid-weight wool-nylon blend designed as a versatile base layer or next-to-skin piece. 145 Mail Preparation - Postal Explorer - USPS 145.zip

To qualify under these standards, the pieces must meet specific dimensions:

: Must be rectangular with square or slightly rounded corners (maximum 0.125-inch radius). Alternative Reference: KUIU ULTRA Merino 145 Zip-T Go to product viewer dialog for this item. : Mailings must consist of at least 200

: More than 11-1/2 inches but not more than 15 inches long.

: All mailpieces must be separated by delivery route or Post Office Box section. 145 Mail Preparation - Postal Explorer - USPS

: Prepared mail must be presented directly to the specific delivery Post Office or destination unit (DDU/S&DC) responsible for those routes.