Premium Waterproof Material -- Vancle for Fitbit Charge 2 straps are made of high quality elastomer in ventilation holes design, swim-ready & easy to dry, prevent skin from irritation; soft, lightweight, more breathable & comfortable to wear. Double Buckle & Fastener Notch -- Especially polished aluminum double buckle design, strong and touch smooth, easy to assemble and resize, holds your Charge 2 replacement bands securely in place and a strap holder with a notch to secure the extra length Effortless Installation & Removal -- Our Fitbit Charge 2 sport bands come with upgraded convenient & durable adapters, locks onto your Charge 2 precisely and securely, NO worry about falling off; Easy and direct installation and one button removal. Adjustable Size -- Small size for 5.5"-7.1" wrist; Large size for 7.1" - 8.7 wrist. More Air Holes Design on the strap, easy to find the most suitable size for your wrist and adjust the length of the band. Perfectly fit for both mens and womens wrist. Various Colours -- Various decent colours for your choice and these fitbit charge 2 straps can be also mixed wearing for your own unique style, personalize your Fitbit Charge 2 to fit your mood and outfit in daily life.