Swamp Green and Butterscotch monster onesies together

Swamp Green monster onesie with a friend

The original big-mouth

The Monster Onesie

$54.99

SoloOne monster. A strong start.

$54.99

Duo SetMost popularTwo matching monsters. The bit begins.

$99.00~~$109.98~~

Squad PackSave $40.96Four monsters. The group photo writes itself.

$179.00~~$219.96~~

Free shippingMix colors & sizes

Sizes run small — pick by height, or open the size guide.

The Monster Comb Included free with every onesie

Free gift

The Fuzzy Slippers Slippers matched to your monster

Ships within 24h · Arrives in 7–14 days · 30-day returns

Description

A big fleece monster with an enormous mouth and eyes that don't quite agree with each other. You will look ridiculous — that's the entire point.

Oversized through the body, long in the arm, built to be lived in rather than worn. Soft coral fleece, front zip, and a pocket with a small face on it.

Buy two and match with someone. Buy four and ruin a group photo properly.

Fit & fabric

Sizes run small — pick by height, not the letter.

S — 4'11″–5'1″ (150–155cm) · 88–110 lb
M — 5'1″–5'5″ (155–165cm) · 110–143 lb
L — 5'5″–5'9″ (165–175cm) · 143–176 lb
XL — 5'9″–6'1″ (175–185cm) · 176–198 lb

Between sizes? Size up — it's meant to swallow you.

Care

Cold wash, low tumble, don't iron the face.

Comes out of the machine fluffed and ready for another week of not being taken off.

Shipping & returns

Free US shipping on orders over $60. Ships within 24 hours; arrives in 7–14 days.

30 days to decide. Not feeling it? Send it back within 30 days of delivery — no forms, no interrogation, no hard feelings.

See it move

Fleece in motion.

day 6: still on

the group chat reacts

wash 4, still fluffy

The people have spoken. Mostly in caps.

He has not taken it off.

Bought the Duo for me and my boyfriend as a joke. It is no longer a joke. It is a lifestyle. The mouth is even bigger in person, which I didn't think was possible.