Size chart

FREE AUSSIE BIRDS 3-PACK
VALUED AT$53.85
Add $100 more to unlock your free gift
Spend $100 or more and we'll add the 3-pack to your order for free. While stocks last.
Orders are typically processed and shipped within 1–3 business days.
FREE standard shipping on orders over $70 across Australia, New Zealand and the USA.
Australia
Standard delivery: 2–7 business days after dispatch
New Zealand
Standard delivery: 5–10 business days after dispatch
USA
Standard delivery: 7–14 business days after dispatch
Returns
For hygiene reasons, underwear can't be returned. Please check our size guide before ordering.
Our underwear is made from 95% cotton and 5% elastane.
We recommend washing in cold water with like colours.

At Sydney Sock Project, we believe in trunks that look good and do good, and our RSPCA NSW trunks are designed to make a real impact for animals in need.
We've partnered with RSPCA NSW, a not-for-profit organisation dedicated to rescuing, rehabilitating, and rehoming animals across the state. From dogs and cats to horses, rabbits, and even farm animals, RSPCA NSW provides care and protection for animals that have been abandoned, neglected, or surrendered.
Why Choose Sydney Sock Project?
Our Impact: With your support, we’ve made over 70,000 donations to RSPCA NSW, helping provide food, shelter, medical care, and support for animals in need.
Premium Quality: Our trunks are crafted with meticulous attention to detail, using high-quality materials to ensure comfort and durability.
Customer Community: Join a community of 250,000+ happy customers who have chosen Sydney Sock Project. Experience the satisfaction of being part of a movement that blends fashion with purpose.
See above our size guide.
For hygiene reasons, underwear can't be returned. Please check our size guide before ordering to find the right fit.
AUS/NZ
Standard Shipping: 2-7 days
Express Shipping: 1-2 days
Rest of World
Standard Shipping: 7-14 days
Express Shipping: 3-5 days