Standard 5mm Socks
Seac's Standard 5mm socks offer excellent foot protection with a warm high ankle cut and a grippy, hard-wearing sole. The premium Yamamoto neoprene has a high flexibility.
If you're wanting more warmth (you're in Tassie after all) a 5mm sock is the way to go. Keep in mind that your current footpocket feels tight you might not fit a 5mm sock.