This lightweight cardigan has side vents and is a perfect addition to your spring and summer wardrobe because it is the perfect thing to throw over your ensembles for style and warmth. The fabric is a mixture of cotton and polyester. If you hold it up to the light, it is very slightly see-through. I continue to live by the well-known fashion advice: a woman can never have too much black in her wardrobe! I include a size chart, but if you need specific measurements just let me know.