First deal post, apologies in advance for any mistakes.
I thought it was unisex but this website has separate listings for men and women.
Women's version: https://www.allsole.com/sandals-women-footwear/birkenstock-w...
At the time of posting, sizes available EU 35-42.
The website's delivery information is outdated, I bought two pairs which to my surprise made me eligible for free delivery. After clicking around a bit, I determined the free delivery threshold should be around >$85.
This code works on many items in the store which includes other popular brands like Doc Martens, Timberlands, Converse etc.