Click on the link here and submit a photo (it can be anything. I uploaded a bowl of rice) and click through the promotional material.
You'll need to submit your full name and email address.
I've done this twice and on both times received a free Heattech top.
Cannot be used online. Valid for first 250 only PER DAY.
After the 250 is exhausted, they will provide a
$20 $5 off $50 purchase code which can be used online.
EDIT: 250 per day. Quota resets at 7am. Thanks Porleng.
Valid till 29 May 2016. Confirmed to be working as of 7am 25 May
The Free Heattech Coupon that is emailed to the entrant must be presented instore before close of business on 1st June 2016 for the winning entrants to be able to collect their HEATTECH product.