Quick answer
A T1C snapback should sit level and snug enough that it stays put when you tilt your head, without pressing a line into your forehead. Because the T1C Tier 1/3BAR Flatbill Snapback uses a snapback adjustment rather than fixed sizing, you set the fit yourself instead of choosing a numbered size.
Why an adjustable snapback changes the sizing conversation
Most hat sizing problems come from buying a fixed size that is close but not exact. A snapback removes that guesswork: the rear closure lets you tighten or loosen the band across a range, so the same hat can suit different head sizes. That does not make fit automatic, though. The adjustment controls the circumference, not the depth of the crown or the shape of the brim, so those are the parts you still need to judge.
This is also why you will not find a numbered size chart for the T1C Tier 1/3BAR Flatbill Snapback in the catalog facts. The product record lists the snapback adjustment but no size range or crown measurements, so treat the adjustment as your fit tool and check the store listing for any additional measurements before ordering.
Flatbill style: what it does and does not change about fit
A flatbill keeps the brim flat rather than curving it, which changes how the hat looks and how the front sits in your line of sight, but it does not change the size of the opening. If you are used to curved-brim caps, expect the flat brim to feel wider in front and to sit a little more horizontal. That is a style difference, not a sizing one, so do not size up or down to compensate.
The practical exception is visibility. A flat brim can shade more of your upper view than a curved one, so if you wear a hat low over your brow, adjust the band first and then check whether you can still see clearly.
T1C snapback fit questions, answered
How should a snapback fit?
The band should feel snug but not tight: it stays in place when you nod or tilt your head, and you can slide one finger under the front edge without the hat lifting. If it leaves a red line after ten minutes, loosen one snap. Test with movement, not just a mirror check.
How do I choose a flatbill snapback size?
Start with the snapback set near the middle of its range, put the hat on, then tighten or loosen until the band is secure. Because the T1C Tier 1/3BAR Flatbill Snapback is adjustable, you are fitting the band rather than picking a fixed size number.
What if the crown feels too deep or too shallow?
Snapback adjustment changes circumference, not crown depth. If the hat sits too low over your ears or rides too high, the crown shape is the issue, and no amount of tightening will fix it. Check the store listing for crown measurements before buying if depth is your main concern. Depth and circumference are separate fit problems.
Can I wear a snapback over thick hair or a low bun?
Yes, but loosen the snapback first, seat the hat, then tighten. Tightening before you put it on tends to pull the band unevenly and leave the hat sitting crooked.
Will the snapback leave marks on my forehead?
A correctly adjusted band should not. If you see a deep indentation, the hat is too tight; move one snap looser and recheck after a few minutes of wear.
How do I keep the fit consistent after washing or rain?
Cloth caps can relax slightly with moisture and wear. Resnap to the same setting once the hat is fully dry, and avoid stretching a wet band to dry it, since that can change the fit. Reset the snap after the hat dries, not before.
Product facts that affect fit
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T1C - TIER 1/3BAR - FLATBILL - SNAPBACK: The T1C Tier 1/3BAR Flatbill Snapback has a snapback adjustment and a Multicam 6-panel all-cloth construction. The snapback closure lets you dial in the band yourself, while the six-panel cloth build is the structure you are fitting to your head shape.
T1C - TIER 1/3BAR - FLATBILL - SNAPBACK