Wellington boots; rubber boots
Refers to knee-high rubber boots, often called 'wellies' in British English. Used in Japanese as a loanword for this specific style of waterproof boot.
On rainy days, I go out wearing Wellington boots.
Variant with a middle dot; less common but still used.
Loanword from English 'Wellington boots', named after the Duke of Wellington. The Japanese form is a direct borrowing.