BUILT Sour Puff bars are a protein-packed confection featuring a soft, airy marshmallow-like center coated in a sweet and tart shell and finished with crunchy sugar sprinkles. Each 1.45 oz bar delivers 16 grams of protein and 150 calories, made with a blend of collagen and whey protein isolate for a candy-bar experience that supports functional nutrition goals.

This Costco variety pack includes 14 bars across three bold sour flavors: Blue Razz Blast, a nostalgic blue raspberry gummy candy flavor; Sweet Peach Punch, a juicy peaches-and-cream swirl of sweet and tangy notes; and Green Apple Crush, a crisp sparkling apple flavor with a tart finish that leaves taste buds dancing.

Ingredients vary by flavor but are based on a Protein Blend of Collagen and Whey Protein Isolate, Sugar, Glycerin, Water, Palm Kernel Oil, Gelatin, Nonfat Dry Milk, Milk, Natural Flavors, Citric Acid, Phosphoric Acid, Soy Lecithin, Salt, Cultured Dextrose, Carnauba Wax, Confectioners Glaze, and Natural Colors. Contains milk and soy. May contain peanuts and tree nuts.