Cairns has a tropical climate, meaning "casual and breathable" is the mandatory dress code. Year-round, you should stick to lightweight fabrics like linen and cotton to cope with the high humidity. Shorts, t-shirts, and sundresses are the standard daytime attire. If you are heading out to the Great Barrier Reef, bring swimwear and a "rashie" (UV-protective swim shirt) to protect against both the sun and seasonal marine stingers. For footwear, "thongs" (flip-flops) are acceptable almost everywhere, but bring sturdy sneakers or hiking boots if you plan to explore the Daintree Rainforest. In the "winter" months (June to August), the evenings can get slightly crisp (15∘C or 59∘F), so a light cardigan or denim jacket is useful. Above all, Cairns is very laid-back; even high-end restaurants usually only require "smart casual" (neat shorts and a polo shirt are often fine).