The New El Naturalista Duna N524 (Black) Women's Lace-up Boots, female, Shoes , Boot , Casual Lace-up, 42 (US Women's 11) M (B), true, Please click for the El Naturalista size chart. Accentuate your already demure demeanor with the stunning Duna N524 boot from El Naturalista. Made of a pull grain and natural sinai leather upper. Pull grain leather is treated with river stones to naturally temper the hide. Sinai leather is composed of calfskin in which only wrinkled leather is used to give a look of aging. Full side zipper allows for easy on-and-off wear while the lacing system delivers a personalized fit. Insoles are a recycled carbon compound that give added support and breathability. The exclusive Frog Shock System is a specially cushioned insole that absorbs the harsh impacts to the heel. The Comfort Last is anatomically angled. The outline adapts to the natural shape of your foot. Natural rubber outsole results in comfortable resistant and extremely long-lasting sole. Also once natural rubber is discarded it degrades much more rapidly than synthetic materials. Measurements: Heel Height: 3 in Weight: 1 lb 2 oz Circumference: 11 1 2 in Shaft: 6 in Product measurements were taken using size 39 (US Women's 8-8.5) width M (B). Please note that measurements may vary by size. Weight of footwear is based on a single item not a pair.