SKU: 34002878359

3:Sixteen Aero Calf Sleeve™ - Black/White (pair)

Sale price$134.99 Regular price$149.99
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Ships within 48 hours · Estimated delivery Jul 20 - Jul 25

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Description

3:Sixteen Aero Calf Sleeve™ - Black/White (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 as 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. 

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

  • 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.
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: 34002878359

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4.4 ★★★★★
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K
Verified Purchase
KayK
Phoenix, US
★★★★★ 5
Anxiety Relief for Elderly Dog
Pattern Name: Heartbeat Sheep Grey, Pattern Name: Heartbeat Sheep Grey
My son and daughter-in-law's 13 year old Chihuahua has been suffering from separation anxiety, and just general anxiety during the covid19 lockdown. While she's in dental school, he's been living with us full time, and she was living at school during the week and with us on weekends. But with campus closed down, there's full-time school anxiety from doggie Mom, and going to work in a plague anxiety from doggie Dad. And nobody has much time for poor stressed out doggie, who barks and whines and is generally unpleasant. The only thing that seems to calm him down is to hold him. All. Day. Long. None of us has time. I decided to see if what works for puppies might work for an old man dog too. Guess what, it does! I started by holding the dog and the lamb on my lap for an evening while watching TV. The next morning I put the lamb in a bed next to my computer while I worked, and he climbed into the bed himself. He never would have done that before! You can't see the lamb in the picture, it's tucked under the canopy. The heartbeat is very relaxing- you do hear it, but it's more like you feel it than hear it, really. I have to admit that the first night when I was holding him, the heartbeat put me to sleep too. When my daughter-in-law came down for lunch, she took dog and lamb back up with her, and he slept with the lamb all afternoon and let her study without interruption. I don't know how long the batteries will last, or how hard they will be to change, but so far this has been a real comfort to an anxious old man dog. ETA- I've ordered batteries (40 for $6.99), and I may order another lamb for upstairs so we don't have to remember whether it's on Mom & Dad's or Grandma's floor. He's a much happier dog.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 29, 2020
K
Verified Purchase
KW
Dallas, US
★★★★★ 5
Puppy
Pattern Name: Heartbeat Sheep Grey
Simply the best! These hold up and are a puppy favorite! They did change the heartbeat sound and it is a bit much for the newborn puppies.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 13, 2025
L
Verified Purchase
Lynne D. Weston
Louisville, US
★★★★★ 1
Pillow is Unsafe
My eleven month old Cavalier, Lacey, loved this heartbeat pillow for about two hours. She carried it everywhere. Then she located the velcro opening. She ripped it open, pulled out the stuffing. I stuffed the heart in the bottom but I cannot locate it in the pillow nor have I found it anywhere in my home. Velcro closure is not enough to keep a curious puppy from figuring out how to open the pillow. Would I recommend this product: No I do not recommend this item. It was a total waste of my hard earned $. The closure needs to be reworked/improved. As it is now, do not leave your puppy alone with this heartbeat pillow because it is not safe! The only positive is it kept Lacey from barking for two hours while she played with it. I cannot attest that it would have helped her severe separation anxiety and yelping every time I leave the house. Lynne Weston Amazon Customer
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Reviewed in the United States on July 14, 2024
S
Verified Purchase
Susan M. Kitchings
Port Orchard, US
★★★★★ 5
Good value
Size: Large
So far so good! Seems sturdy enough for my little guy. Good value for the price.
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Reviewed in the United States on June 2, 2026
K
katie clenshaw
Bozeman, US
★★★★★ 5
my dogs love these! their new constant companions!
When I first opened the box and saw these three octopuses, I thought they looked a little anemic, but looks can definitely be deceiving because my dogs love them. We try to be really careful about the toys we buy because one of my dogs swallowed a squeaker in the past and had to have surgery. Ever since then, we've been really mindful about what toys they have and making sure we're watching them when they play. I have to say these have been great. My dogs carry them everywhere. They take them outside, bring them back inside, and I've had to wash them multiple times because they are so loved and so well used. For some reason, my dog who is a constant chewer and destroyer of toys has not chewed through these. They feel relatively tough, especially considering how lightweight they are. They do have a squeaker inside, but they also have something crinkly in them that makes noise when the dogs are running around and playing with them. My dogs seem to love that. My dogs also look super cute running around with the octopus legs hanging out of their mouths. Fun product!
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Reviewed in the United States on June 9, 2026

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