Leather is a natural product with special characteristics that make it comfortable to wear, and give it great strength and flexibility. Because it is a natural product, with its own unique variations, every piece has its own individual characteristics. As they are worn and used, leather gloves (especially if they fit snugly) will conform to the wearer's hand. As this occurs the leather of the glove will become more malleable, and thus softer and more supple. This process is known as 'breaking-in' the glove. Overtime wear spots may appear on certain parts of the palm and fingertips, due to the constant use of those areas of the glove. Creases and wrinkles will appear on the palm side of the leather glove and will generally correspond to the locations of the hinge joints of the wearer's hands, including the interphalangeal articulations of hand, metacarpophalangeal joints, intercarpal articulations, and wrists.