Yes. A 100% Pima cotton garment will shrink in a hot dryer, and most of that shrinkage happens the first time. Heat is what causes it — water alone changes very little.

Why does heat shrink cotton and water does not?

Cotton fibers are stretched under tension during spinning and knitting. That tension is held in the fabric. Heat and agitation release it, and the fibers return toward their relaxed length, pulling the garment with them.

A cold wash and a flat dry release very little of that tension. A hot tumble dry releases most of it at once.

How much does Pima cotton shrink?

Published figures for cotton knits commonly fall in the range of three to five percent for a first hot wash and dry, varying with knit structure, finishing and machine settings. On a T-shirt body that is roughly an inch of length.

We have not run AATCC 135 dimensional-change testing on our own fabric, so we do not publish a number for our garments. When we do, we will name the test and the result.

Can you shrink a Pima cotton shirt on purpose?

To a degree. A hot wash followed by a hot dry will pull a garment down, but you cannot control where. Sleeves and body do not shrink proportionally, and the result is usually a shirt that is shorter rather than narrower.

Buying the right size is more reliable than shrinking a larger one.

Does a shrunk cotton shirt stretch back?

Partly. Wearing it stretches the fabric again across the body, and the garment recovers some length. It does not return to its original measurements, and repeated hot drying compounds the loss.

How do you keep a Pima cotton T-shirt from shrinking?

Wash cold with similar colors. Tumble dry low, or lay flat to dry. Skip bleach. Iron cool if you iron at all.

That is the whole method. The instruction that matters most is the dryer setting, because that is where the damage happens. What are the disadvantages of Pima cotton?