Fillable Ice Bag - 3 Layer Design Ensures that the Injured Area Remains Dry During Use; Layer 1 #Soft outer covering made of non-woven Spunlace Material, Layer 2 # An absorbent middle layer that wicks away moisture from condensation, Layer 3 # A leak resistant inner layer. The two piece hook and hinge articulated clip is easy to use and clicks when shut to assure proper closure. This design ensures longer life of the ice bag. A wider mouth design allows for easy filling and less mess. 30-40% Wider than competitors. 3 Options for Keeping the Bag in Place: Option 1 # Tie attachment Option 2 # Adjustable Hook & Loop elastic strap attachment Option 3 # Without attachments (traditional style).