A T-shirt with two personalities
Depending on the weather, you can either opt for the lighter version with 125 gsm or choose the 145 gsm version on cooler days. But what does this value actually mean?
The abbreviation gsm stands for "grams per square meter" and indicates the basis weight of the fabric. The higher the number, the thicker and warmer the material generally is, as more wool has been processed on the same surface area.
Some people may wonder what difference 20 gsm makes, but from my own experience I now know that this is more than a nerdy side note or a factor for weight fetishists. The 125 gsm shirt is airy, cools and dries incredibly quickly if you get a little sweaty on a climb or in the midday sun.
The "heavier" version with 145 gsm is also light to wear, but never gives you the feeling of being too thin, especially on days in the transitional period between spring and fall. It is also very suitable as a base layer under a warmer layer. This was precisely Penguin's idea: 125 gsm as an option for warm days and sporting activities, 145 gsm as warming insulation, ideal for fall hiking or as a layer under other clothing. Incidentally, the difference in weight is due to the use of superfine yarn with less than 17 µm.
