Introduction
Ever ordered a hoodie online only to find it fits like a tent? Or a tee that shrinks two sizes after one wash? If you're a fan of Peter Attia's work - whether from his podcast, his book Outlive, or his deep dives on longevity - you want merch that feels as intentional as his approach to health. This Peter Attia merch sizing guide will walk you through the exact measurements you need, the fit differences between hoodies and tees, and pro tips to get it right the first time. By the end, you'll order with confidence.
Understanding Peter Attia-Inspired Apparel Sizing
Our curated collection draws from the same philosophy Peter applies to health: precision, consistency, and quality. The fabrics we use - mostly ringspun cotton and cotton-poly blends - have minimal shrinkage (about 3-5% after first wash). But sizing varies between styles.
Why Size Charts Differ by Garment
Most t-shirts in the store use a standard unisex cut, which means they fit slightly looser in the shoulders and chest. The hoodies use a pre-shrunk fleece that runs true to size but feels roomier because of the lining. For example, a size L t-shirt has a chest measurement of 40-42 inches, while the same size hoodie measures 44-46 inches.
The Role of Fabric Weight
Heavier fabrics (like 6 oz. tee or 8 oz. hoodie) hold their shape better. Lighter ones (4.5 oz.) may drape more. I've found that medium-weight tees (5.3 oz.) are the sweet spot for most people - they don't cling but also don't look baggy.
How to Measure for the Right Fit
Follow these steps with a fabric measuring tape. If you don't have one, use a piece of string and a ruler.
Step 1: Measure Your Chest
Wrap the tape under your armpits, around the fullest part of your chest and shoulder blades. Keep it snug but not tight. Exhale normally. For a relaxed fit, add 2-3 inches to your measurement.Step 2: Measure Your Waist
Find your natural waistline (near your belly button) and measure around. Most tees are designed to sit straight, not cinched, so this matters more for fitted styles.Step 3: Check Sleeve Length
With your arm slightly bent, measure from the center of your back (at the base of your neck) across your shoulder to your wrist. Hoodies often have longer sleeves (up to an extra inch) to account for movement.Step 4: Compare to the Size Chart
Each product page has a size chart with chest width, body length, and sleeve length. Never rely on your usual shirt size - always measure and match. Pro tip: If you're between sizes, size up for hoodies (they shrink in length more) and stick with the larger size for tees if you prefer a relaxed look.Hoodie vs T-Shirt Fit Comparison
I've designed and worn both, and here's the real difference.
The Hoodie Experience
Hoodies from our collection are cut with a wider chest and longer sleeves. The kangaroo pocket adds visual bulk, so a size M hoodie may look more like a L on camera. The fleece lining also softens over time, which slightly loosens the fit. If you plan to layer over a thick shirt, go up one size. I recommend our “Outlive” inspired hoodie for its durable 80/20 cotton-poly blend - it holds its shape wash after wash.
The T-Shirt Approach
Unisex tees have a shorter body length - about 28 inches for a size L - which looks better untucked. The cut is straighter through the hips. Our “Longevity” tee uses a 4.5 oz. ringspun cotton that feels soft from day one but may show fit changes after the first wash (shrink up to half an inch in length). For a slim fit, take your exact chest measurement. For a standard fit, add 2 inches.
Which One Should You Choose?
If you're active (running, gym, outdoor walks) - go with the tee for breathability. If you're at a desk or lounging - the hoodie is more forgiving. I personally wear a L in the tee and an XL in the hoodie for the same comfort level.
Tips for International Shoppers
We ship worldwide (select countries) via print-on-demand. Standard delivery to the US is 5-10 business days. For international addresses, allow 2-3 weeks. Here's how to avoid sizing mishaps.
Know Your Conversions
Sizing in the US (S, M, L) corresponds to chest inches. In Europe, you'll see numbered sizes (46, 48, 50). Use this rough guide: S = 34-36, M = 38-40, L = 42-44, XL = 46-48 inches. Always cross-check with the product's inch chart.
Account for Regional Fit Preferences
Asian sizing tends to be cut smaller, so if you're used to Japanese or Korean brands, you might need to size up one or two sizes from your usual US size. Australian sizes are similar to UK sizes (which are a half-size larger than US). The safest move? Measure a shirt that fits you well and compare its flat chest width to the chart.
Customs and Duties
We're not responsible for import fees, which vary by country. Orders above certain values may incur VAT or duties. Check your local threshold before ordering. Most customers report no issues for orders under $100.
Key Takeaways
- Measure yourself using the steps above, not your assumed size.
- Hoodies run looser and longer than tees; size up if in doubt.
- Fabric weight matters: heavier holds shape, lighter drapes.
- International buyers should convert inches and account for regional sizing norms.
- Always check the product size chart - each style can vary by up to 2 inches.
FAQ
What if my measurements fall between two sizes on the chart?
For t-shirts, size down for a fitted look or up for a relaxed fit. For hoodies, always size up - the fleece lining needs a bit of room to avoid feeling tight.
Do these clothes shrink after washing?
Only about 3-5% on the first wash due to the pre-shrunk cotton process. To minimize shrinkage, wash in cold water and tumble dry on low. Avoid hot water and high heat.
Can I get a refund if the size doesn't fit?
Please visit our Contact page for assistance. We do our best to help with exchanges within the first 30 days for defects or errors in the order. We cannot cover fit preferences, so please measure carefully.
Is the merch officially licensed by Peter Attia?
No, our store is a fan collection inspired by the ideas and community around Peter Attia's work. We do not claim any official endorsement or licensing from Dr. Attia or his team.
How long does international shipping take?
Standard international orders typically arrive in 2-3 weeks, but can take up to 4 weeks depending on customs. Tracking is provided once the order ships.
