Silicone Solo Loop Watch Band Sizing Guide 38mm/40mm/41mm: S is suitable for wrist sizes 6.49"-7.08" (165mm-180mm) M is suitable for wrist sizes 7.12"-7.48" (181mm-190mm) L is suitable for wrist sizes 7.51"-8.26" ( 191mm-210mm) 42mm/44mm/45mm: S is suitable for wrist sizes 6.88"-7.28" (175mm-185mm) M is suitable for wrist sizes 7.32"-7.67" (186mm-195mm) L is suitable for wrist sizes 7.71"-8.46" (196mm-205mm) Important Note: Before making your purchase, it's crucial to ensure the good fit for your wrist. Please take a moment to measure your wrist size accurately Compatible Model: 49mm Bands Compatible with Watch Ultra?2022? 45mm 41mm Bands Compatible with Watch Series 8?2022?Series 7 (2021) 44mm 40mm Bands Compatible with New Watch SE / Series 6 (2020) 44mm 40mm Bands Compatible with Watch Series 5 (2019) / Series 4 (2018) 42mm 38mm Bands Compatible with Watch Series 3 (2017) / Series 2 (2016) / Series 1 (2015)