14 reviews
Size Chart
Grey Marle

 Spark up your favourite riding top when colder climes arrive. Unique InfraRed™ fabric against your skin wicks chilling sweat away while the FarRed™ mineral print reflects heat inwards for increased warmth and comfort.

  Slim Fit - ensuring the fabric sits against your skin to keep you warm and dry. Size up if you like more room.

  • Unique InfraRed™ stretch polyester fabric blends the thermal might of polyester with a magic FarRed™ mineral print to reduce heat loss and increase circulation. Toasty.
  • 'Snug-as-a-bug' fit keeps the fabric against your skin to wick sweat away.
  • Full flat seaming and offset side seams for next-to-skin comfort.
  • 'Racerback' let's you stretch out without restraint.
  • WXL size available.
  • Designed & made by us in Aotearoa | New Zealand.

  Weight: 110 gm

A thin, form-fitting stretch polyester base layer that enhances the thermal performance of any riding top. Brushed polyester fabric dries super fast while magic is performed by the FarRed™ mineral print against your skin - reducing 'far infrared' heat loss for increased circulation and comfort. 
  • Composition: 84% polyester; 16% lycra

+More than Kiwi Made
Ground Effect clothing is crafted right here in New Zealand. Has been ever since we started back in 1994. Manufacturing locally works for us. We operate a quick-response system - holding minimal stock of any one item, but churning out a few more quick-smart when the pile gets low. The upshot is that we are seldom caught with our shelves empty, so orders get despatched the same day you place them.

+Heatwave™ Merino vs InfraRed™ polyester?
  • Your base layer is a critical part of your clothing system in cold conditions. Its primary purpose is to move excess sweat away for your body to minimise the cooling effect of any dampness against your skin.
  • Heatwave™ Merino is sensational when you're on-the-go in cold, dry conditions. It keeps you warm by absorbing and dispersing any sweat, letting it evaporate faster. However you can 'overload' the fabric with prolonged use or in wet conditions. At that point it no longer has great thermal properties. So, an excellent choice while you're moving and expending energy, but can cause you to chill out if stopped for an extended time.
  • InfraRed's polyester fibres absorb almost no moisture - so the fabric dries considerably faster when you stop exercising. A moisture management treatment plus a brushed finish against your skin helps disperse sweat (but not quite as effectively as merino does). In addition the FarRed™ mineral print against your skin reduces 'far infrared' heat loss. A good choice in wet conditions and if you anticipate any faffing around on your ride, or on multi-day adventures when you need your clothing to dry overnight.
  • Heatwave™ has the additional benefits of the low-odour properties of merino wool. The FarRed™ mineral print also disguises smell - but to a lesser extent in our experience.
  • 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. 
Customer Reviews
4.5 Based on 14 reviews
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Filter Reviews:
    Louise M.
    Australia Australia

    I love this base layer so much I bought a second, for days when I don’t get a chance to wash it. I use it cycling, running or any activity where I want an extra layer.

    Carol T.
    New Zealand New Zealand
    Sooo lovely and warm

    I purchased one long sleeve and one tank and love'em. Since I received them (only took a day), they’ve been worn continuously - one in the wash, the other on. I’m long in the body and these suit my shape well enabling no cold gaps. Nice one Ground Effect - thank you

    Australia Australia
    Sparkler - a disappointment

    I bought a Sparkler to replace my Ristretto, which is no longer available in the XS size suitable for smaller women. What a disappointment - there is next to no coverage on the shoulders, tops of the arms or neckline. The fabric does not compare favourably to the lovely warm merino of the Ristretto. What's more, it is very long. Please, Ground Effect, don't forget your loyal customers who are smaller women.

    Ground Effect

    Hi there Susan, thanks for your review. This summer we will be doing a big change to our womens sizing that will have more range at both the smaller and larger end of our sizing. If the Sparkler is a much warmer and technically more advanced material than merino as it reflects your heat back at you but if it is the wrong size, and you have only tried it on size, then pop it back to us for a refund or exchange. Pedal on, Ernie.

    Shirley S.
    Australia Australia

    After deliberating for days to buy this top I finally took the plunge and bought it. Not being a thermal person as I get hot anyway I have found this to be “just right”. I like it so much I use it for other activities and it is great under normal t.shirts, rugby tops and the like. I highly recommend this garment.

    Dallas W.
    New Zealand New Zealand

    I got the large size and it really was too snug around the tummy.Big women have tummies so this large size needs to tent out more and not just be a large version of the racing sardine sizes

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