My most recent pair.
Eyelets on the leg portion both front and back.
This yarn has an interesting component.
It's called Outlast.
I've pulled a couple of explanations off the web for ya.
originally developed for NASA,
utilizes phase change materials (PCM) that absorb,
store and release heat for optimal thermal comfort.
Outlast® technology is comparable to ice in a drink;
as it changes from solid to liquid,
it absorbs heat and cools the drink,
keeping that drink at the desired temperature for longer.
Outlast® phase change materials work in the same way, but are microencapsulated to be permanently enclosed and protected in a polymer shell.
We call microencapsulated phase change materials Thermocules™.
This encapsulation process makes the Thermocules™ exceptionally durable for many applications.
These Thermocules™ can be incorporated into fabrics and fibers and have the capacity to absorb, store and release excess heat.
This gives any product
containing Outlast® technology the ability to continually regulate skin’s microclimate.
As the skin gets hot, the heat is absorbed,
and as it cools, that heat is released.
Outlast® technology is not wicking technology,
which manages moisture by reacting to your sweat and pulling it away from the skin.
Outlast® technology will proactively manage heat while controlling the production of moisture before it begins.
The Loopy Ewe has this to say:
"This sock weight yarn is made from
superwash Merino, nylon and Outlast
Outlast, a fiber technology that interacts with
the body's microclimate to moderate temporature
to help from being too hot or too cold.
It's yarn with a built-in climate control !"
Anyhoo, they feel great on my feet and I love the colors.
What more could a gal ask for?