57 reviews
Size Chart
Grey Marle

Seamless knitted merino arm warmers to extend your short sleeved Median Strip or Hula riding top into a winter assault weapon.

  • Grey Marle with wide reflective cuff.
  • Toasty merino wool inner and hard-wearing nylon outer.
  • Soft knitted non-gripper elastic cuffs.
  • Knitted with elastane for a snug fit.
  • Designed by us. Made in Aotearoa | New Zealand.

  Weight: 74 gm

Toasty Merino wool knitted sock with nylon plated to the outside for durability. Blended with elastic for stretch.
  • Composition: 42% merino; 24% elastic; 19% lycra; 15% nylon.


  • All Ground Effect clothing enjoys a warm 40ºC machine wash. Try to avoid cold-water detergents and those with bleach, 'oxygen whitener' or fabric softener.
    • The cold-water varieties have little enzymes that are super-charged to brave the cold but can damage technical fabrics and cause skin irritation. 
    • Bleach rots natural fibres like merino, strips the dye, attacks laminates of waterproof fabrics and can also cause skin irritation.
    • Sodium Percarbonate (the main ingredient in oxygen whitener) can make colours run.
    • Fabric softener and stuff containing it like wool wash destroys the water repellent finish on waterproof and water resistant fabrics, and can cause colours to run. 
  • As a rule of thumb, a product that is easy on the planet is also easy on your body. Select a mild plant-based soap like EcoverEcostoreEarthwise or Aware.
  • Hand washing is sometimes the only option on tour, but a washing machine rinses more thoroughly and is preferable if you have the choice.
  • Most Ground Effect gear dries super-fast so hanging on the line or drooping over the bedpost is generally the best option. High heat can damage some fabrics so if you do take your threads for a spin, set the device on 'medium' or 'warm' rather than hot. A lap in the dryer is recommended for your rain jacket, after it has dried on the line, as it helps recharge its water repellent finish. 

  • Wash colours separately.

+ Shipping
  • Items are generally packed and sent the same day your order is received.
  • Costs $7 by overnight courier within New Zealand.
  • NZ$7 by tracked airmail to Australia.
  • Around NZ$15-25 by tracked airmail to destinations elsewhere in the world - calculated in our shipping cart as you check out. 
    • More shipping and tax details in our FAQ.
    Customer Reviews
    4.9 Based on 57 reviews
    Write a Review

    Thanks For Your Review

    We value your feedback. If you're stoked with your Ground Effect kit then you might like to share it (the review not the gear) with your mates. Thanks again.

    Filter Reviews:
      Rick M.
      Australia Australia

      Awesome arm warmers. The merino wool is soft on the skin and wicks away sweat. Just starting to cool down here in the Great South West of Victoria and these are great: give them a try you wont be disappointed!

      Hugh M.
      Australia Australia
      Love GE

      I bought some Armadillos earlier this year. After the first use, the wrist hem on one of them came loose. I wrote to GE, not complaining, just to let them know. Within a couple of hours GE replied, apologised and sent me a new pair. I replied that this was unnecessary, but the new pair were already on the way. My ‘problem’ now, is that I have two pairs of really good arm warmers. The Armadillos are a great bit of kit, probably a bit too good for most Brisbane winters but lovely none the less. GE are simply the get what you pay for, plus, ethics and integrity thrown in. Keep pedalling.

      Wendy P.
      Australia Australia
      Socks for your arms

      These Armadillo arm warmers are the best thing I've purchased for a good long time. I absolutely love the feeling of new socks, and these arm warmers are exactly the same feeling except they're on your arms. They are soft, cosy warm and soooo comfortable. I can wear them for a full ride, they don't make me feel overheated, in fact I forget I'm wearing them. Even when I take a layer off when I warm up, I don't take these Armadillos off because they're so perfectly in tune with my body's natural temperature.

      Australia Australia
      Brilliant but...

      These are great kit - warm, comfortable. The only BUT is the fact that the stitching around the wrist came loose after 2 rides...and came out completely after about 5 rides. Not a big deal but not what I expected from GE.

      Ground Effect

      Hi Hugh, sorry to hear this. We will contact you separately re replacing the faulty Armadillos, thanks Ernie

      Philip T.
      Australia Australia
      Armadillo arm warmers - medium size

      Another quality product from Groundeffect. Good fit, comfortable, warm and well made.