An infinity scarf, also known as a ring scarf or a cowl, [1] is a circular scarf without defined ends. [2] [1] Unlike traditional scarves, they do not need to be fastened around the neck. [3] They are often worn doubled, though they may be worn in a singular loop, [1] or looped further if desired. [4] A regular scarf can be fitted to mimic its appearance. [5] Infinity scarves were popular in 2010s fashion. [6] Two infinity scarves from a Canadian business were gifted to Barack Obama's daughters from Justin Trudeau. [7] Instructions for how to wear them were one of the top Google searches for fashion in 2019. [8] The trend declined when blanket scarves (which are bigger than infinity scarves) faced renewed interest. [9]