Pretty Polly 15 denier opaque natural tights medium/large 1 pack these tights contain added stretch for complete comfort with a sheer elegant finish. These tights have a graduated compression that massage legs as you walk, boosting circulation and reducing swelling. As worn by virgin Atlantic cabin Crew. Pretty Polly working hard for working legs. Pretty Polly Everyday 15 denier tights are perfect and practical for everyday wear with an excellent value for money.