BT STXL R V2

Lightweight motorcycle undersuit

Name: Lightweight motorcycle undersuit
Brand: SIXS
SKU: SL12BTSTXLR_BC___XSS
Price: 128.0 EUR
Availability: InStock

€128,00

Color:

Size:

XS/S

M/L

XL/2XL

3XL/4XL

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Full undersuit engineered for intensive motorcycle use
Enhances heat and sweat dissipation in extreme heat
New reinforced yarn in critical high-friction areas
Multi-zone construction for targeted ventilation and durability
100% Made in Italy

Features

Maximum breathability
Moisture management
Antistatic
Seamless
4-way stretch
Antibacterial fabric
Hydrophobic
SPF 50

BT STXL R V2 is the full undersuit developed to perform under leather suits and protective technical gear.

It belongs to the LIGHT BT V2 line: the lightest and most breathable platform ever created by SIXS, designed for intense heat, humidity, and high perspiration. It is engineered to release the body’s excess heat.

The V2 version integrates a new reinforced yarn, specifically developed to improve durability and long-term resistance in high-stress areas.
40% lighter than the 4-Season line.

While riding, it translates into:

Constant dry feeling
Reduced friction under the suit
Greater comfort during long rides
Stability under protectors

BT STXL R V2 is the most advanced summer technical undersuit for the motorcycle segment within the LIGHT BT V2 platform.

Machine wash at 40°C
Do not use fabric softener
Do not bleach
Do not dry clean
Do not tumble dry
Recommended: Dry flat in the shade
Do not iron
Recommended: use a laundry bag to prevent damage during washing

The Core Benefits

Active heat management

The LIGHT BT V2 fabric is designed for intense heat and high perspiration. Its breathable structure promotes heat dispersion and accelerates moisture transfer to the outside.

Multi-zone construction

The multi-zone construction combines more compact, durable areas with high-ventilation zones, while the anatomical design improves the garment’s fit during use.

More durable yarn

The V2 version introduces a more durable yarn in high-friction areas, improving durability and garment stability under protective gear.

Fabric

LIGHT BT V2 architecture

The LIGHT BT V2 fabric is engineered for intense heat, humidity, and high perspiration. It promotes body heat dispersion and accelerates moisture transfer to the outside, helping keep the skin dry during activity.

The multi-zone construction combines more compact, durable areas with high-ventilation zones, placing breathability and stability exactly where needed.

40% lighter than the 4-season line, it represents the lightest and most breathable platform ever developed by SIXS.

100% Made in Italy.

Temperature and activity intensity chart for SIXS LIGHT BT V2 summer baselayer

Designed for use under suits

When to use it

This undersuit was created for:

Racing and sport riding
Summer touring
Long-distance riding in hot conditions

The close-fitting structure prevents folds and fabric buildup under the suit, reducing pressure points and improving stability while riding.

Technical construction

Multi-zone

The structure combines different functional areas:

Compact solid knit
Positioned in friction zones against the suit for increased resistance.

Mesh areas
Located in high-sweat zones to promote heat dispersion and accelerate evaporation.

Supportive elastic structures
Ensure stability, anatomical fit, and seamless continuity under protectors.

The new reinforced yarn enhances durability in stressed areas without compromising lightness and breathability.

V2 evolution

More resistant, more stable

Compared to the previous version:

More resistant yarn in critical areas
Optimized anatomical fit
More precise mapping of friction zones
Redesigned elastic waistband: higher at the front and lower at the back to follow the riding posture
Improved long-term structural stability

The new waistband configuration is engineered to adapt to the motorcycle riding position, maintaining stability without creating abdominal pressure and ensuring continuity in the lower back area.

Breathability remains the core DNA of the LIGHT BT V2 line: the garment promotes moisture expulsion, reducing the wet sensation and preventing sudden cooling during stops.

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