54 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.

Customer Reviews
4.9 Based on 54 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:
    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.

    Philip T.
    Australia Australia
    Armadillo arm warmers - medium size

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

    Fiona T.
    New Zealand New Zealand
    love my armadillos

    I just love the armadillos, they are so snuggly and warm and then when I warm up I just push them down. they stay in place perfectly without squashing my arms and love the styling too

    Mark W.
    Australia Australia
    I was sceptical. Merino arm

    I was sceptical. Merino arm warmers? They are brilliant, ridiculously warm, perfect for winter, late Autumn, early spring. I reckon I might still need a lighter pair though for early autumn/late spring though, when it's a bit warmer

    Andrew B.
    Australia Australia
    Love em

    I didn't think they would stay up but they do. Love the feel of them also.