Neck 18""-26"", Width 1"", Size Large; The collar does not stretch itself. Martingale collar is a slip collar **WITHOUT THE BUCKLE**, which is designed for sighthouds but becomes popular with other breeds. Please take the measurements at the head and neck showing in the size chart. Especially for non-sight hounds, PLEASE CHOOSE A COLLAR SIZE THAT IS LARGE ENOUGH TO SLIP OVER THE HEAD | Warning: martingale collar is not for tie out. NEVER leave your dog unattended with a collar on. This product is NOT recommended/designed to use without leash and NOT for indoor use. The personalized collars help ensure the safety of your pet if they wander off or get lost | EMBROIDERED COLLAR - Customized in the USA. Petàname and phone number will be embroidered on different pattern collar, and embroidery range of dog collar is limited. Please pick embroidery thread color (font color) and enter exact text you want to display on the collar. We have 11 font colors for your choice: Marron, Dark Violet, Yellow, Dark Cyan, Sunkist Coral, Orange, Black, Grey, Royal Blue, Red, Green | PET'S NAME/PHONE NUMBER MAY BE PARTIALLY COVERED BY THE CLASP - The beginning of the first embroidery character will be relatively fixed ,and sometimes the name/ numbers will be tuck into if you adjust this collar with different length, that does not affect normal use. We are open to customers' voices; Don hesitate to contact us for more details | COLOR DIFFERENCE - Due to different computer monitors/calibrations, colors may vary slightly from the picture, but all pictures are taken with production samples. Other customized products please search ASIN B074366GFZ & B079FPJXFN