Ibex Arm Warmers

Warm, unbulky, comfortable
Perfect for cold-cool morning commutes (~30-40F); warm, unbulky, unbinding, doesn't slip, long enough to cover wrists, but stretchy enough to easily move away from watch. Easily adjusts on biceps to allow a bit of pit-venting between short-sleeve shirt sleeve and top of arm warmer. Packs small, stays unstinky. Can't comment on durability yet. I have size small, my biceps max at ~11". It just fits in the forearms and biceps - if it stretches out I may have issues with slipping.

Great quality product!
I have not used the product, but looking at its construction, it looks well made and durable. I also have the Smartwool arm warmers and these Ibex arm warmers appear to better made overall, but they are also more expensive. The sizing are for men; for women, make sure you order a size lower than what your normal size would be.

Sold on wool
You can't beat the comfort of wool on cool winter days. These lightweight arm warmers are perfect for these conditions and fold neatly to fit in your back pocket when unneeded. The elastic bands keep the warmers in place without the annoyance of rolling down your arms.