What Is a Kotatsu? Japan's Coziest Winter Tradition (and Why Cats Love It)

If you have ever seen a photo of a cat in Japan with only its head poking out from under a blanket-covered table, you have already met the kotatsu.

What is a kotatsu?

A kotatsu is a low wooden table with a small heater fixed underneath the tabletop. A thick, quilted blanket is draped over the frame, and the tabletop sits on top of the blanket. You sit on the floor, slide your legs under the blanket, and the warm air stays trapped around you.

That's it. No central heating, no roaring fire. Just one warm square in the middle of the room, and everyone gathered around it.

A very old idea

The kotatsu is far older than electricity. Its roots go back to the Muromachi period, around the 14th century, when Japanese homes were warmed by the irori, a sunken cooking hearth in the floor. Over time, people separated the sitting from the cooking, built a frame over the heat source, and covered it with cloth.

For centuries the heat came from charcoal. In the mid-20th century, charcoal was replaced by an electric heater attached to the table itself, and the kotatsu became the portable, plug-in table that is still in many Japanese homes today.

A winter evening under the kotatsu

In Japan, winter at home often looks like this: the kotatsu in the living room, the TV on, a bowl of mikan (small mandarin oranges) on the tabletop, and the whole family's legs tangled underneath. It's where people eat, chat, do homework, and, very often, fall asleep.

Getting out of a warm kotatsu on a cold morning is so hard that it's a running joke in Japan. Many people would rather stretch an arm to reach the remote than leave.

Why cats love the kotatsu

Cats figured all of this out long before we did. A kotatsu is dark, quiet, enclosed and warm: everything a cat looks for in a sleeping spot.

There's even a well-known Japanese children's song about it. "Yuki" ("Snow"), published in 1911, describes a snowy day where the dog runs happily around the garden, while 「猫はこたつで丸くなる」, the cat curls up in the kotatsu. More than a hundred years later, that's still exactly what happens.

A few cozy-safety tips for cat owners

A kotatsu is warm enough to be too warm for a small animal that falls asleep inside. If your cat loves the kotatsu (or your heated blanket, or the spot next to the heater), a little care goes a long way:

• Keep the setting low. A cat doesn't need the same heat as human feet.
• Leave an exit. Fold back a corner of the blanket so your cat can come out to cool down whenever it wants.
• Keep water nearby. Warm, dry air makes it easy to get a little dehydrated.
• Check in now and then, and switch the heater off when no one is home.
• Protect the cord if your cat likes to chew.

If your cat seems lethargic or unwell after a long nap in the heat, call your vet.

Bring the kotatsu feeling home

You don't need a kotatsu to borrow the feeling. Pick a low table, add your heaviest blanket, put a bowl of mandarins in the middle, and turn the lights down. Your cat will find it within minutes.

And if you'd rather wear the feeling, our Kotatsu Cat Embroidered Sweatshirt shows a sleepy black cat peeking out from under a red kotatsu, with a mikan waiting on top. It's real embroidery on a soft crewneck, made to order, with free shipping to the US and Japan.

See the whole Japanese Winter Cats collection.

Written by Pokaya in Japan, with help from AI writing tools.