Special color blending technique creates a beautiful Palette of Rainbow Colors. Certified Break Strength Tested to 386 Lbs, by an International Independent Testing Laboratory. Important Sizing Note: The following measurements are the dimensions of the actual product, not of the pet they fit. After measuring your pet, make sure all measurements fit within the following dimensions (with a little room to spare in the chest and neck). XX-Small Chest: 9"-11" (Most Important) Pets Weighing: 2lbs.-3lbs. X-Small Chest: 11"-13" (Most Important) Pets Weighing: 4lbs.-6lbs. Small Chest: 13"-16" (Most Important) Pets Weighing: 6lbs.-11lbs. Medium Chest: 16"-19" (Most Important) Pets Weighing: 11lbs.-16lbs. Large Chest: 19"-21" (Most Important) Pets Weighing: 16lbs.-25lbs.