LEATT

Leatt ThermaFlow 4.0 MTB Jacket V26 2026: BLACK

SKU LE5026054851

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RidingMTB

A casual yet technical hoodie, the ThermaFlow 3.0 combines all-day comfort with cold-weather performance. Its helmet-compatible hood, over-the-chin coverage, and PFAS-free water-resistant treatment protect from wind and light moisture, while laser-cut ventilation prevents overheating. YKK zippered side pockets provide secure storage, and brushed elbow panels add durability for everyday riding.

Features

Regular fit with pre-shaped ergonomic sleeves
Helmet-compatible hood with stretch panels
Over-the-chin coverage for added protection
Laser-cut ventilation for airflow
YKK zippered side pockets
Reflective logo on back
Brushed elbow panels

Leatt jerseys, jackets and tops

Fit tip For a riding jersey most people take their chest size; if you prefer a looser fit over body armour, go up one size.

How to measure

Chest: wrap the tape around the fullest part of your chest, under the arms, keeping it level. Height: stand straight against a wall without shoes. Arm: from the bone at the back of your neck, over the shoulder and down to the wrist. Measure in cm and compare with the table. For a riding jersey most people take their chest size; if you prefer a looser fit over body armour, go up one size.

Find my size

Enter what you can measure; we'll match it to the table.

Size	Chest (cm)	Height (cm)	Arm (cm)
XS	91-96	162-168	62-63
S	96-102	168-172	63-64
M	102-106	172-178	64-65
L	106-112	178-182	65-66
XL	112-116	180-185	67-68
XXL	116-122	182-188	68-69
3XL	122-127	183-188	69-70
4XL	127-132	183-190	70-71
5XL	132-137	184-193	71-72

Size	Chest (cm)	Waist (cm)	Arm (cm)
XS	82-86	60-63	59-60
S	86-90	63-66	61-62
M	90-94	67-71	63-64
L	94-98	72-76	65-66
XL	98-102	77-81	67-68
XXL	102-104	81-84	67-68

Size	Chest (cm)	Height (cm)	Arm (cm)
XXS	66-69	100-110	46
XS	69-74	110-120	49
S	74-78	120-130	54
M	78-81	130-140	60
L	81-89	140-150	65
XL	89-92	150-160	70

Applies to Leatt jerseys, jackets, hoodies and T-shirts. Women's sizes are listed by chest and waist.

See all size guides

Fit tip For a riding jersey most people take their chest size; if you prefer a looser fit over body armour, go up one size.

How to measure

Chest: wrap the tape around the fullest part of your chest, under the arms, keeping it level. Height: stand straight against a wall without shoes. Arm: from the bone at the back of your neck, over the shoulder and down to the wrist. Measure in cm and compare with the table. For a riding jersey most people take their chest size; if you prefer a looser fit over body armour, go up one size.

Find my size

Enter what you can measure; we'll match it to the table.

Size	Chest (cm)	Height (cm)	Arm (cm)
XS	91-96	162-168	62-63
S	96-102	168-172	63-64
M	102-106	172-178	64-65
L	106-112	178-182	65-66
XL	112-116	180-185	67-68
XXL	116-122	182-188	68-69
3XL	122-127	183-188	69-70
4XL	127-132	183-190	70-71
5XL	132-137	184-193	71-72