Uncle Bob's Ugly Beer Sweater Novelty Bottle Covers (Set of Six. Straight out of Uncle Bob's attic. Each ugly beer sweater is knitted out of acrylic yarn so it can stretch over almost any bottle. Make your beer the best-dressed (and tackiest) this season. Adds a festive touch to holiday parties, and could possibly win some contests. You will receive one beer cover per order in an assorted style of our choice. A great stocking stuffer. One Uncle Bob's Ugly Beer Sweater Novelty Bottle Cover. You will receive one beer cover per order in an assorted style of our choice. Made of acrylic yarn the will stretch over most standard beer bottles. Make your beer the best-dressed (and tackiest) this season. A great stocking stuffer.