Entro Leopard Print Bubble Flutter sleeve top entro Sweaters Entro Sweater Poshmark Entro Trend Boutique Urban Renewal Remnants Drippy Sleeve Bubble Sweater Urban Outfitters. A classic staple that every closet needs. Introducing the Bubble Sweater by Entro, a charming addition to your winter wardrobe in a delightful light blue hue. This piece features long sleeves and a mock neck, perfect for the Thanksgiving or Back to School season. Made of 52% acrylic, 28% nylon, and 20% polyester, this textured sweater offers a unique style while ensuring comfort. Closure: Pull On.