Features: 【Compatibility】Attention please, there are two 42mm size, but belong to different Apple Watch Series. Please choose the correct model fromd dropdown menu. 【3rd Gen Buckle Magnetic Clasp Adjustable 】 Only need adjust the buckle Once, and it will stay fixed, no more adjustment any more, compared to the old version adjust buckle,double magnetic buckle provide a more stable locking, stay locked and more easy to put on since you could unclasp to the buckle to have more room to get wrist through. 【Stretchy Sport Strap】 Most Perfect Combo, if you always search for a band, which could wear all day long, and don't feel uncomfortable, the one piece sport loop with magnetic clasp allow you could get the perfect fit plus it's stretchy, it could provide minor room during a active time.