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Thermoregulator Base Layer - Men's

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OVERVIEW: The Thermoregulator has been designed to provide a stretchy form fit and optimal moisture transfer and heat regulation during cool or cold weather rides. The unique construction using Dryarn®, not only the lightest textile fabric in the world but exceptionally efficient at pushing moisture away from the skin, means the Thermoregulator Base Layer simultaneously keeps you warm and dry without feeling bulky or heavy. 

Peloton Magazine"Pactimo, based in the home of schizophrenic weather (Colorado), designed the Thermoregulator to be the perfect foundation of any cold-weather wardrobe. It absorbs less moisture, breathes better and transfers more moisture than other fabrics. What's truly amazing is that in cold weather it works like a thermostat, transferring heat and moisture but retaining heat while still transferring moisture when you need warmth. It's comfortable and cozy without being bulky." 

FABRIC & CONSTRUCTION: Dryarn® is a high-performance microfibre providing top levels of physical comfort even in the presence of frequent and unexpected changes in climate conditions and variations in the intensity of physical effort. Dryarn’s low coefficient of heat dissipation, prevents any unwanted loss of body heat and at the same time enables the rapid dissipation of excess heat via evaporation of perspiration. This is facilitated through a capillary action where perspiration is collected and carried along the fibre to the surface where it can evaporate. The exceptional stretchiness and comfort of this garment is achieved with XLA® Fibers.


  • Dryarn® Polypropylene 93% and Elasten XLA® 7% 
  • Pactimo TotalFit™ design for excellent anatomical fit 
  • 0° - 40° F

Ideal pairing is with any of our cool or cold weather garments such as the Alpine Thermal RT Jersey or with a regular jersey and the Cascade RT Jacket. Layering in cold weather cold helps maintain core body as warm air is trapped in the various layers of moisture-wicking clothing. 

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Size & Fit Chart

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Fit Guide


Items designed to provide a traditional performance fit.


Items in this category have been designed to provide an aerodynamic form fit.

Second Skin Fit


Items in this category have been designed to provide an ultra form fit.

Fit Videos

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Size Charts

Custom cycling clothing size chart example - man
Pactimo Cycling Clothing Size Chart
Custom cycling clothing size chart example - woman

PLEASE NOTE: Not all garments are available in every size listed on size charts.

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Measuring Tips 


Using a soft measuring tape, bring the tape across your back under each arm, around the front. For women, measure the widest point of the bust. For men, measure around the largest part of your chest.


Bend to one side to find natural indentation in torso. This is your natural waist. Run tape around waistline, keeping tape parallel with floor. 


Stand on a level surface with feet together. Measure around fullest part of hips and bottom (approximately 7" - 9" below waistline), keeping tape parallel with floor.

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