What role does the underarm 'gusset' mentioned in the top description play?
When you see the unfamiliar word 'gusset' in the description of a fleece hoodie or long sleeves, you ask to check what difference this detail makes when wearing the clothes and moving.
A gusset is a structure where an extra piece of fabric is added to the inside of the underarm to provide extra room so the clothes do not pull tight when lifting your arms or making large movements.
A gusset is a sewing method that adds three-dimensional room by attaching a separate piece of fabric to the underarm where seams intersect. In standard tops, the seam where the body and sleeve meet easily pulls tight, so when you raise your arms high, the hem of the garment often rides up with them.
WELTER EXPERIMENT's Python Fleece Pullover Hoodie Black and Python Fleece Long Sleeves T-Shirt Black feature this gusset detail in the underarms[1][2]. The brand explains that the gusset in the long sleeves T-shirt increases freedom of movement during activities[3].
When extra room is secured under the armpits, the hem of the top does not easily ride up even when reaching forward or raising arms overhead. You can move comfortably without feeling caught, even during outdoor activities involving frequent large movements or when layering over other clothes.


The specific pattern shape of the gusset area or whether a separate fabric is used has not yet been confirmed in official materials.
Product measurements
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Python Fleece Long Sleeves T-Shirt Black
Measurements
| Part | S | M | L | XL |
|---|---|---|---|---|
| 총장 | 62cm | 67cm | 69cm | 71cm |
| 소매길이 | 85cm | 88cm | 91cm | 93cm |
| 가슴단면 | 51cm | 53.5cm | 56cm | 58.5cm |
Python Fleece Pullover Hoodie Black
Measurements
| Part | S | M | L | XL |
|---|---|---|---|---|
| 총장 | 63cm | 67cm | 69cm | 71cm |
| 가슴 ◦ | 52cm | 54.5cm | 57cm | 59.5cm |
For rows marked with ◦, flat measurement or circumference could not be confirmed in official sources, so hmmm determined them using figures from the same item.
Other stated figures
| Part | S | M | L | XL |
|---|---|---|---|---|
| 소매 ◦ | 85cm | 88cm | 90cm | 92cm |
For rows marked with ◦, flat measurement or circumference could not be confirmed in official sources, so hmmm determined them using figures from the same item.

