Recommended products: Bodyfit series, GT series
 
Smartwool and Ice Expander are the two giants in the Merino wool products market, both of which are part of VF, the world's largest ready-to-wear group, with sales of about $220 million in 2017. His clothing line, Bodyfit, has won the Gold Award in the Editor's Choice of Backpackers magazine.
 
Ice expanders use temperature control coefficients to measure warmth, and the higher the value, the warmer it is. The temperature control coefficient of 150, 200, 260 and 320 is equivalent to suitable for all seasons, comfortable and slightly cool, warm and breathable, and warm and cold. Its clothing lines Bodyfit, GT and Cool-Lite all have undercoats, but only the Bodyfit and GT series have better warmth.
 
In terms of product layout, Ice Expander is also very similar to Smartwool, its classic base layer series Bodyfit is made of 100% merino wool, with a temperature control coefficient of 150, 200 and 260 items, in order to be used in spring, autumn and winter. The GT series can be seen as an upgrade of the Bodyfit series, which covers all the temperature control coefficient items of the ice expander, compared to the Bodyfit, it has added more styles suitable for winter warmth, and it uses a blend of merino wool with lycra and nylon, which enhances the elasticity and durability of merino wool products.
 
Ice Extension has the same advantages as Smartwool Merino wool products, and the colors and styles are more vivid and lively, but due to the lower quality of wool, the skin-friendly feeling is not as good as Smartwool. Experiments have shown that the quick-drying ability is superior to the ice expander, but at the same weight class, the Bodyfit is less warm than the Smartwool NTS 250. The price is 800 yuan - 1100 yuan, which is comparable to Smartwool, and there is no advantage in price.