Edited by MANLY Journal · Published and updated
The cover is an illustration. Its sun, snowflake and water symbols do not represent cooling or drying tests, and the illustrated garments are not tested MANLY product samples.
Looking at two T-shirts in the same colour and cut and wondering: cotton or polyester for your summer clothes? Open each garment’s details and compare five points. The same fibres can be used in clothing with different weights, construction and feel.
This guide focuses on the buying decision. For the basic differences between the fibres, read our cotton and polyester comparison for Gulf heat.
1. Where will you wear it, and what do you need?
Decide on the main use: an air-conditioned workplace, university and errands, or training? For everyday wear, start with a garment you already find comfortable. Check its composition, cut and feel, and use it as a reference. Liking a particular cotton tee is a practical reason to compare similar pieces, but it is not a verdict on all cotton.
For training, list what matters: room to move through the shoulders, seams that do not bother you, or quick drying after getting wet. Our gym T-shirt guide covers movement and fit. If you have plans after training, packing a second tee is a simple option; one garment does not need to do every job.
2. What do the cotton and polyester percentages tell you?
Read the full composition: is it 100% cotton, 100% polyester or a blend? “Cotton” wording alone may not give every fibre’s percentage. Note any elastane too. If percentages are missing, ask for a photograph of the composition label instead of guessing from a picture or the feel of the fabric.
A blend is not automatically better, and a higher polyester percentage does not turn any garment into performance sportswear. In a study of double-layered knitted fabrics, yarn arrangement and composition affected moisture transfer and drying. The findings concern the tested samples; they do not rank all cotton and polyester clothing from best to worst.
An example from a product page
The To be continued Tee listing specifies 100% cotton, a straight cut, short sleeves and a crew neck, with the Japanese つづく print across the chest. These details help you choose the design and composition. They do not establish a drying time or cooling performance; those are separate properties that need their own evidence.
3. Do the weight and fit suit you?
Compare chest width, body length, sleeves and shoulder-seam placement with a garment that fits you. Sit down and raise your arms when you can try it on. Do not choose a larger size just to get more comfort: it may change the length and shoulder placement too.
If fabric weight is listed in GSM, that means grams per square metre. It helps you compare weight, but does not measure breathability or guarantee durability. See our 260 and 300 GSM guide for more detail. A heavier fabric may give you a look you prefer, but it is not necessarily the better choice for every summer outing.
Some people prefer more room around the body, but dropped shoulders alone do not establish better airflow. Our guide to loose clothing and cooling separates fit from performance. Choose a colour that works with your wardrobe; colour alone does not determine drying speed or suitability for training.
4. Does “absorbs sweat” mean “quick drying”?
No. Separate three properties:
- Absorption: how much moisture the fabric takes up and holds.
- Wicking: liquid moving and spreading through the fabric.
- Drying: water leaving through evaporation over time.
NC State’s textile laboratory assesses aspects of absorption, transport and evaporation separately. One description therefore cannot stand in for all three. Cotton is not limited to absorption: research from Cotton Incorporated explains that fabric preparation and construction affect moisture transport and drying. This is a cotton-industry source, not a test of MANLY products.
What should you ask about a “quick-drying” claim?
Ask whether the information concerns this model or a general fabric type. What comparison method was used, against which fabric, and under what conditions? If details are unavailable, treat the drying time as unknown. That does not prove the garment is poor; it means you should not base a performance-dependent purchase on an unexplained claim.
5. Does the care fit your routine?
Read the garment’s own washing temperature, drying and ironing instructions. Do not apply one temperature to all cotton or assume every polyester garment retains its colour and shape regardless of care. For travel, check care requirements instead of treating the fibre name as a guarantee against creasing.
Check instructions for prints too. For example, the To be continued Tee listing recommends washing inside out with similar colours and ironing inside out, away from the print, while following the label for washing temperature and drying. Preserve the design by following the instructions for the model you choose.
A quick comparison before adding to your basket
| Point | What to record |
|---|---|
| Use | Work, errands or training, and your most important requirement |
| Composition | Each fibre and percentage, plus any listed lining |
| Weight and fit | Weight if available, and measurements against a garment you own |
| Performance | Supported information about the model and what remains unknown |
| Care | Washing, drying, ironing and print instructions |
After comparing, choose the garment that suits your day and preferences. It may be cotton, polyester or a blend. Know why you are choosing it and what you still need to confirm before ordering.