An open knit sounds practical for heat until you wear one and realize it is just air. But that is the entire point. Pointelle and fishnet and mesh knits do one job perfectly: they breathe. Veronica Beard's Deveraux pointelle is structured enough to wear alone or as a layer. Tibi's Sheer Crepe Knit is semi-transparent, which means it needs something underneath but looks intentional that way. Aje's Tazia crochet pants are the heavier version. Frankies Bikinis' Fleur crochet dress combines structure with openness, so you get coverage and ventilation together without sacrifice.

Sometimes you do not need open holes, just lightweight fabric that moves against your skin without restricting it. Nili Lotan's Selah Silk Knit Tank is so fine it barely registers against your body. Frankies Bikinis' Jennie cotton bodysuit in comet is tight but light enough for heat. St. Agni's Silk Canvas Cami performs the same function as a much heavier camisole would. Ulla Johnson's Catroux long sleeve silk blouse in orchid is the print option, and because it is linen-silk it does not cling uncomfortably. The pattern covers creasing that happens in heat.

Summer knits that work in cold rooms are a practical necessity for office work or restaurants. Staud's Midnight Cashmere Cardigan is genuine cashmere and weighs almost nothing. St. Agni's Merino Wool Slit Sleeve Sweater has openings built in so you do not suffocate. Jenni Kayne's Cashmere Burke Polo in cashmere is the structured option for layering. Tibi's Skinlike Mercerized Wool Soft Sheer Pullover performs like a silk but has the warmth of wool underneath. All four work over a tank without adding real bulk or excess weight.

The choice between pointelle, cotton and cashmere depends on where you spend your summer and what temperature you need to manage. Pointelle and open knits are for walking and sitting outside. Cotton and linen are for places that fall somewhere in between comfort and practicality. Cashmere is for inside air conditioning, where you need something but not much, and you want it to feel as close to nothing as possible. If you take one thing away, it is that summer knits are not a single category: they are three different solutions.