
Fitwarm's Marine set places two UPF 50+ shirts at the lowest effective garment cost in this comparison, with all six listed sizes available and a verified 20% direct markdown in U.S. product data. The brand targets small dogs and cats and describes the shirts as breathable, soft, and stretchy. Its page publishes an unusual material order of 90% spandex and 10% terylene; we preserve that exact wording but recommend confirming it with Fitwarm if fiber composition affects care, allergy, or purchase decisions. The sole public rating is not meaningful evidence of broad fit. Treat the listed sizes as small-pet apparel rather than assuming XXL fits a large dog, measure the actual chest and back, and stop use for restriction, rubbing, or heat discomfort. The exact brand-hosted MP4 is documented but cannot be embedded by the current YouTube/Vimeo-only component.