Condom sizes are primarily categorized by nominal width (the flat width of the opening), which is the most important factor for a secure fit: Snug/Slim Fit: Narrower width (typically 47–49mm) and length at 170mm. Designed to prevent slippage for those who find standard condoms too loose. Standard/Regular Fit: The most common size (typically 52–54mm) and length at 180mm. Fits the …