Engineered base layer · Made for men 25–45
BSLYR
The structural layer beneath your shirt.
Engineered for posture and recovery. Built quietly. Worn under everything.
Shop the layer01
Smooth silhouette under any shirt
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Posture support, all day
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Recovery between sessions
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The structural layer
Built to disappear under everything you wear.
Four-way compression engineered for posture. Flat seams that sit smooth under woven shirts. Thermo-regulating fabric that breathes through the gym, the office, and the back-to-back calls between.
Refined for men who notice fit and don't talk about it.
Choose your layer
Shop BSLYR
Early customer feedback
The most common piece of feedback we get
"First time my polo doesn't pull weird across the chest. The layer just sits there and the rest of the day works."
— Early customer · 03/2026
"Wore it under a dress shirt for back-to-back meetings. Posture stayed up, the shirt sat right. I forgot I had it on by 3pm."
— Early customer · 04/2026
"Bought one for the gym, ended up wearing it every day. Built to disappear is the right description."
— Early customer · 04/2026
Questions
FAQ
How does it fit?
BSLYR is engineered as a structural under-layer. Sized true-to-shirt — order your standard t-shirt size. The fabric stretches in four directions for full range of motion. Sizes S–XXXL.
When will it arrive?
We ship from our manufacturing partner in 7-15 business days. You'll receive tracking once your order is dispatched, typically within 48-72 hours of purchase. Reply to your order confirmation any time for a status update.
What if it doesn't fit right?
30-day money-back guarantee. If the size isn't right or the layer doesn't work for you, email hello@bslyr.com and we'll refund the order — no return needed.
Can I wear it under a dress shirt?
Yes. The flat seams sit smooth under woven shirts. Designed specifically to disappear under polos, dress shirts, and t-shirts.
Is it machine washable?
Yes. Cold machine wash, tumble dry low. The compression structure holds up through 100+ washes.