SKU: 36643517003

3:Sixteen Aero Calf Sleeve™ (pair)

Sale price$67.49 Regular price$74.99
Save 10%

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 11 - Jul 16

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

3:Sixteen Aero Calf Sleeve™ (pair)Save up to 12 Watts Athletes can now benefit from the watt saving technology found in our record breaking Aero Bridge Undervest. Compared to aero socks, the extra calf coverage gives even greater aerodynamic and time savings. Saving up to 12 watts, these Calf Sleeves are the best investment on the market, with the highest watt aero gain. Developed Alongside the World's Greatest Utilising the same technology as our Aero Bridge Undervest, the 3: Sixteen

 

Save up to 12 Watts

Athletes can now benefit from the watt saving technology found in our record-breaking Aero-Bridge Undervest. Compared to aero socks, the extra calf coverage gives even greater aerodynamic and time savings. Saving up to 12 watts, these Calf Sleeves are the best investment on the market, with the highest £/watt aero gain.

Developed Alongside the World's Greatest

Utilising the same technology as our Aero-Bridge Undervest, the 3:Sixteen Calf Sleeve is born. Developed at the Silverstone Sports Engineering Hub and Derby Velodrome alongside the World's greatest engineers and riders. 

The Calf Sleeves were first introduced to the sporting World during the Sub7 / Sub8 challenge, with the design and name 3:Sixteen a nod towards the 3-hour 16-minute bike leg that was achieved to help guide Joe Skipper to a sub 7-hour Ironman. The team comprised of some of the World's best time-trialists, including Alex Dowsett and recently crowned UCI Hour Record holder Dan Bigham, who crushed the opposing team to deliver one of the most incredible time trials of all time.

Patented Aero-Bridge Technology - How it Works

By stretching smooth fabric over ribbed fabric (raised ridges form a suspension of material like a suspension bridge) to disrupt the airflow by the ridge and then further alter it by the suspended fabric, causing minuscule air particles to enhance displacement of the boundary layer. 

  • Up to 12 Watt saving.
  • Designed for the Sub7 Sub 8 record-breaking challenge.
  • Dan Bigham designed and enhanced.
  • Precisely patterned to maximise aero gains.
  • Aerodynamic materials.
  • TT and track proven.

For sizing, measure the widest part of the calf.

Calf guards can be worn in triathlon competition under your wetsuit and for the duration of the event.

Warranty Information

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 36643517003

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.0 ★★★★★
Based on 1859 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
L
Verified Purchase
Liam
Battle Creek, US
★★★★★ 5
Another great book
Format: Hardcover
Loved this for my wild child
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 8, 2026
R
Verified Purchase
Rena
Omaha, US
★★★★★ 5
Favorite book!
Format: Board book
This is our family's all-time favorite book!!! It is so cute and makes bugs fun! It is educational, with cute little rhyming words and great illustrations
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 27, 2025
S
Verified Purchase
sfalc
Bozeman, US
★★★★★ 5
The kid and I both love this book
Format: Hardcover
I am so enamored with the illustrator of this book that I've taken to buying almost everything he does. The illustrations here are so cute and playful! My daughter wants to read this almost every single day. She loves to point out the bugs on the different page and we make up stories about them. She can now recognize so many bugs we when go outside and is really excited to see them in real life! She laughs at the antics of the ladybug on each page and loves that there are different animals hidden in with the bugs. Really can't say enough good things about this book. My only caution is that there aren't really a lot of words, so if you aren't comfortable ad-libbing or making up stories you may find it a bit boring. But if you make it interactive it's really fun!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 1, 2020
B
Verified Purchase
Bug
Chelsea, US
★★★★★ 5
Greatest book on the planet
Format: Board book
This book was purchased for me as a baby shower gift. My daughter is obsessed with this book. We have read it so much that our first copy has seen some damage (the book is sturdy, the damage is our fault). I had to get another copy just to keep forever. I will also be purchasing the hard cover book to keep in my collection to have forever. The illustration is brilliant, we love Oscar, the writing itself is so fun. I love that it encourages exploration, play, as well as education. 10/10 - this is our favorite childrens book ever. We read it maybe 30 times a day.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 19, 2024
J
Verified Purchase
Jackthepumking
Lexington, US
★★★★★ 5
Cute Rhymes and wonderful info
Format: Board book, Format: Board book
This book is super cute and makes bugs interesting with it's colorful pages and different big varieties. The book rhymes throughout the pages and it's so cute and almost reminds me of song that could have sung by the "Animaniacs" (my age is showing lol). In one of the pics I show the cover damaged but that's from my son chewing on the book. Just because it's a board book doesn't meant it's exempt from damage, just makes it last a little longer than a paperback. I also REALLY like that there is a page that lists the bugs seen along with their names which is helpful in teaching your little one! My son enjoyed this beautiful book. :)
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 15, 2023

recommand products