Pactimo Ambassador Club Men&
Pactimo Ambassador Club Men&
Pactimo Ambassador Club Men&
Pactimo Ambassador Club Men&
Pactimo Ambassador Club Men&
Pactimo Ambassador Club Men&
Pactimo Ambassador Club Men&
Pactimo Ambassador Club Men&
Pactimo Ambassador Club Men&
Pactimo Ambassador Club Men&
Pactimo Ambassador Club Men&
Pactimo Ambassador Club Men&
Pactimo Ambassador Club Men&
Pactimo Ambassador Club Men&

Men's Pactimo Ambassador Club Zero-Weight SL Base Layer

13 reviews
Regular price$45.00
Shipping calculated at checkout.

Made-to-Order items are individually manufactured for you upon ordering. They will be shipped separately from other items you purchase and will be delivered in
18 - 24 DAYS from the date ordered.


OVERVIEW: This ultra-lightweight, super stretchy base layer has been designed to provide a performance form fit and optimal moisture transfer and heat regulation during warm weather rides. The honeycomb structure of the knit not only wicks perspiration away from the skin but it also facilitates air movement between the jersey and base layer which speeds evaporation and cooling. Only 55 grams in a size medium. 


  • Zero-Weight mesh (93% Polyester / 7% Spandex)
  • Honeycomb texture to maximize wicking performance
  • Next to skin form-fit design

Have questions about sizing,
fit or garment usage?

Don't hesitate to contact us.
We are here to help and answer all your questions!

877-291-6238   |

Pactimo Cycling Clothing Size Chart

Kid's Cycling Clothing Size Chart

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

Arm, Knee and Leg Warmer Sizes

Shoe Cover Size Chart

Custom cycling sock size chart

Cycling Glove Size Chart

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.



Typically delivers in 3-5 business days
(Standard Shipping Option)


USPS Priority

1-3 business days.

USPS Priority Service Map

USPS Shipping Map

USPS Priority Express

1-2 business days.

* Please note: All orders placed after 8 am will be fulfilled the following business day.

FedEx 2-Day Shipping

Arrival in 2 business days.

* Please note: Orders placed after 11 am will be fulfilled the following business day.


Additional Information for USA Orders

All orders must be shipped within the USA, Puerto Rico or an APO.
At this time we do not offer shipping to Canada.

All Made-to-Order (MTO) and Jersey for a Cause items are delivered 14-16 days from the date of purchase via FedEx Express. Please note that FedEx cannot deliver to PO Boxes. If you order an MTO item and use a PO Box, your order will be shipped to our Denver office and forwarded to the PO Box via USPS. 

PLEASE NOTE: Information on this page does not apply to custom clothing orders.
For information about Pactimo Custom, please visit


  • Free Shipping on Orders $70+


Made-to-Order items are individually manufactured for you when you place an order.


Made-to-Order items carry the same warranty and performance guarantee as our in-stock items.

learn more

No additional cost

Made-to-Order items are not subject to additional process or shipping charges.

Returns & Exchanges

If for any reason you are unhappy with your purchase, Made-to-Order items can be returned or exchanged just like in-stock items.

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Why Made-to-order?

Our Made-to-Order Collection of garments allows us to offer a greater range of styles, colors and designs.

inside the factory
Customer Reviews
4.8 Based on 13 Reviews
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A Pactimo Customer
Marc L.
United States United States
PAC Zero-Weight SL base layer

This base layer does a great job of wicking uniformly during very hot weather. It's a go to piece of kit all the time now! Similar experience with cooler temps - it's very versatile as a base layer.

Austyn H.
United States United States
It does it’s job

Great product, but order a size up if you aren’t a pro cyclist. I bought the same size as my normal traditional jersey and it is a little small.

Mario M.
United States United States
I really want to like it but…

It’s way too short. I ordered an XL, that is the size I wear in almost all cycling clothing. I also own a Pearl Izumi base layer in the same size that is much longer. The material is great, the fit is nice but even when wearing bibs, the shortness of the base layer causes it to ride up and is kind of a problem. I don’t know if the factory in China ran out of material or…? When I compare the length to my Pear Izumi base layer, there are at least an additional 3-4 inches in length needed to make the base layer seem like a normal base layer. If I were to wear this as an indoor cycling shirt it would practically be a ‘belly’ shirt. Def not how I roll! So unfortunately it works for basically only one use and that’s under bibs and even at that job it’s only marginally acceptable. Otherwise the material is great the fit is a little tight but works out ok as well. I guess the factory in China is trying to tell me to lose weight!

Rick D.
United States United States

This thing is amazing. My first time using base layers, and now own one for every kit. It truly works as advertised. It keeps me cooler when hot and warmer when cool, even in incredibly humid conditions. It keeps your core at “ideal” temperature. I quote that as it kept me warmer than I would have guessed, however I immediately saw a performance improvement as I was apparently “cold” maybe a degree or two but it truly made a difference. Definitely go a size larger than your jersey. I exclusively wear the ascent aero line in an xl(5’8” 220lbs) and went with xxl from other reviews and it is spot on.

Matthias W.
United States United States
Excellent for hot days

Top-notch fabric. Arm holes are a bit small. I often use size S Pactimo but sized up to a M for this, and found it still pinched a bit. Not noticeable on the bike but it chafed when I went for a brick run after a bike session. Perfectly comfortable for riding!

Pactimo Men's Pactimo Ambassador Club Zero-Weight SL Base Layer Review
Tyler C.
United States United States
Cool in the heat

First time using base layers in summer. This is ideal for Arizona heat as it wicks moisture and keeps me cool

Pactimo Men's Pactimo Ambassador Club Zero-Weight SL Base Layer Review
Scott S.
United States United States
Zero-Weight SL Base Layer

Was initially on the fence about buying a base layer. Thought I would give it a try. These are GREAT! Wicks away moisture very well. I don't think I will ride without it.

Adam L.
United States United States

This under garment is amazing. I have purchased ten different times ranging over 9 years, and each garment improves on the last. This is even though the first zero weight garment was amazing. Great products from a great company that continually improves cycling!!!

Pactimo Men's Pactimo Ambassador Club Zero-Weight SL Base Layer Review
Brian F.
United States United States
I really like this base layer.

Pactimo Zero-Weight SL Base Layer. I really like this base layer. Fits snug, once you have your jersey on the combination is really good. I tend to use race fit jerseys and this base layer works excellent with them. Highly recommend this base layer!

A Pactimo Customer
David A.
United States United States
Base layer

Really loving this, great for cool mornings or as a sweat layer while zwifting indoors. Will certainly buy more of them.

Tyler C.
United States United States
Keeps cool

Perfect for warm southwest temps. Moisture wicking and regulates temp better than anticipated. I'll be adding a second

Howard N.
United States United States
Base Layer Convert

I’d never worn a base layer before, especially not in the summer. But this is a great product that absorbs sweat on those hot summer rides.

Larry A.
United States United States
Base layer

Theses clothes are always great.

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