A beautiful name that clearly speaks of the winter season.
The word "wintr" contains only five letters and just one syllable. Mono-syllable names are exceptionally rare and very desirable. Successful brands using one syllable names include Square, Dell and Chase.
Wintr.com is a dot-com domain. Dot com domains are the most prestigious domain extension in the world, famously used by websites like twitter.com. When most people think of a website, they think of a dot-com.