Mike
Wears M
"Loose through the shoulders, perfect for basecamp lounging."
SIZE ME UP
FIND YOUR FIT
We run comfy. Wedgie-proof drop crotches, relaxed mid-section, proper length. Room to breathe, room to chill.
What's my size?
Enter your height — we'll recommend a size. Add weight for a better pick.
Your size
—
Adult onesie — measurements
| Size | XXS | XS | S | M | L | XL |
|---|---|---|---|---|---|---|
| Suitable height | 150–160 | 161–168 | 169–175 | 176–185 | 186–195 | 196+ |
| A — Bust | 86 | 93 | 98 | 108 | 115 | 126 |
| B — Hip | 96 | 102 | 109 | 115 | 122 | 135 |
| C — Length | 153 | 157 | 162 | 168 | 174 | 178 |
Kids onesie — measurements
| Size | 4 | 6 | 8 | 10 |
|---|---|---|---|---|
| Suitable height | 100–115 | 116–125 | 126–135 | 136–145 |
| A — Bust | 75 | 77 | 80 | 86 |
| B — Hip | 80 | 86 | 89 | 93 |
| C — Length | 99 | 113 | 122 | 131 |
How to measure
A
Bust
Measure around the fullest part of your chest, keeping the tape level under your arms.
B
Hip
Measure around the widest point of your hips, about 17cm (7") above the crotch.
C
Length
Measure from the base of your neck down to your foot, standing straight.
How it fits real people
Not numbers on a chart — actual Unichillers in their onesies.
Ciara
Wears XS
"Cozy but not swimming. Length is perfect, no bunching at the ankles."
Ryan
Wears L
"Finally a onesie tall enough. Zero tug in the crotch when I squat."
Jocelyn
Wears XXS
"Between XXS and XS — went down, got the snug cabin fit I wanted."
Our fit philosophy
We don't design for runways — we design for couches, cabins, and the drive between. Between sizes? Go up for couch mode, down for snug. 350 GSM pre-shrunk fleece, so what you get is what you keep.
I'm between sizes. What do I pick?
Size up if you want max couch energy — extra room, easy layering underneath.
Size down if you prefer a snugger, cleaner silhouette.
Will it shrink after washing?
No. 350 GSM pre-shrunk fleece. Wash cold, tumble low. What you buy is what you keep.
I'm tall (6'3"+). Will the length work?
Our Large goes to 195cm (6'5") and XL beyond that. We design with extra crotch drop so tall frames don't get the dreaded tug.
Does the onesie stretch?
Fleece has a natural soft give — not like lycra, but enough that it moves with you. You don't need to size up for mobility.
My kid is between sizes. Size up?
Yes. Kids grow fast, and our cuffs roll easily. A size up buys you 6–12 extra months of wear.