How to Choose: Fit, Fabric, and Feel
Material and Construction
The Peter Attia Classic T-Shirt is made from 100% ring-spun cotton, which gives it a soft hand that gets better with each wash. It's pre-shrunk, so the size you order stays the size you get - no surprises after the first dry cycle. The fabric weight is light enough for summer but substantial enough to hold its shape over time.
Fit Profile
This tee has a relaxed unisex fit. It's not slim, not baggy - just roomy through the chest and shoulders with a straight hem. The shoulder seams sit naturally, and the sleeves hit mid-bicep on most body types. If you prefer a more tailored look, you can size down. For a loungier feel, size up. Here's a quick size chart in inches (chest width):
| Size | Chest Width | Length |
| S | 18" | 28" |
| M | 20" | 29" |
| L | 22" | 30" |
| XL | 24" | 31" |
| 2XL | 26" | 32" |
Design Details
The front features a subtle, tonal Peter Attia wordmark in a clean sans-serif font - small enough to be understated but legible. The back is blank, keeping the focus on the front logo. No tags inside: the sizing info is printed directly on the fabric, so there's no scratching. Available in black, navy, heather gray, and white.