A turtleneck is a type of sweater or shirt characterized by a high, close-fitting collar that folds over and covers the neck. This design provides warmth and comfort, making turtlenecks popular in colder weather. They can be made from various materials, including wool, cotton, and synthetic fibers, and come in different styles and colors. Turtlenecks can be worn by both men and women and are versatile enough to be dressed up or down. They are often paired with jackets, blazers, or worn alone for a chic look. Famous figures like Steve Jobs and Audrey Hepburn have popularized the turtleneck in fashion.