The boxing gloves in the 300 series are made from medium-density moulded foam covered with synthetic fabric (PU).This design is very durable and will make your gloves last longer. Thanks to the 3D structure, the mesh fabric on the palm offers excellent perspiration winking during training bouts and punch bag workouts, BEGINNER BOXERS training once or twice per week: choose gloves that release perspiration and fit snugly around your wrist.- INTERMEDIATE BOXERS training two or three times per week at a club or with a punching bag: choose gloves with a thick leather or PU covering and medium- or high-density foam. ADVANCED BOXERS training more than four times a week: choose durable gloves with a thick cover made from natural or synthetic leather. Glove sizes are given in ounces (the measurement used worldwide for boxing gloves).Boxers choose their gloves based on their body weight and the kind of boxing they do:o properly protect your hands and gloves, remember to wear: INNER GLOVES that are easy to put on. They help prevent chaffing of your hands, and absorb perspiration to make your gloves last longer. OR BOXING WRAPS, a basic boxing accessory! They are designed to support your joints (metacarpals and wrists) while absorbing perspiration. To ensure your gloves last longer, we recommend drying them after each training session. To do so easily, we recommend getting glove dryers.