Fashionable true gradient compression tights for mommas-to-be. Graduated compression increases circulation, prevents swelling and energizes tired legs and feet, delivering a controlled amount of pressure from the ankle up. Preggers by Therafirm Firm Compression Opaque Tights Feature: 30-40mmhg of firm graduated support Support top expands to your growing belly needs and can be folded under or pulled over an active momma's belly for comfort Smooth seams will not dig into your tummy or show under clothes Super soft yarns are breathable and provide shaping support Moisture-wicking provides a comfortable coolness Fashionable design for everyday wear Made 100% in the USA Nylon and Spandex blend Care: Hand wash in lukewarm or cold water with mild detergent. Lay flat to dry.Gradient compression hosiery is constructed differently than traditional hosiery. Those who have never worn gradient compression before may feel that these garments are difficult to put on or tighter than traditional hosiery. It is this "snug" fit that provides the graduated pressure. It is very important to measure the ankle, calf, and sometimes thigh to ensure a proper fit and to receive the benefits of the graduated compression.