I have just ordered one of the new Nov 2018 MacBook Airs that only come with Thunderbolt 3 (USB-C) ports. Just looking for a simple clean solution for a highly performance adapter using the USB-C physical connector.

In the following tests, I compare the speed to transfer, one the same Cat6 ethernet network, over the same cables, through the same routers:

The Belkin adaptor also got very very hot, and smelled burnt. I cannot explain the wildly variable results from the Belkin either. An adaptor that returns worse results on a much faster 2018 Macbook Air (using USB-C) than Apple's own Thunderbolt adaptor on the 2014 Macbook Air frankly beggars belief. Whether the fault is the Belkin unit (of which there are many complaints on the Apple store site) or some inferior aspect of using USB-C compared to Thunderbolt ... I cannot say.

I have just ordered one of the new Nov 2018 MacBook Airs that only come with Thunderbolt 3 (USB-C) ports. Just looking for a simple clean solution for a high performance adapter using the USB-C physical connector.

In the following tests, I compare the speed to transfer, on the same Cat6 ethernet network, over the same cables, through the same routers:

The Belkin adaptor also got very very hot, and smelled burnt. I cannot explain the wildly variable results from the Belkin product either. An adaptor that returns worse results on a much faster 2018 Macbook Air (using USB-C) than Apple's own Thunderbolt adaptor on the 2014 Macbook Air frankly beggars belief. Whether the fault is the Belkin unit (of which there are many complaints on the Apple store site) or some inferior aspect of using USB-C compared to Thunderbolt ... I cannot say.

I have just ordered one of the new Nov 2018 MacBook Airs that only come with Thunderbolt 3 (USB-C) ports.

Does there exist a Thunderbolt 3 to Gigabit ethernet adapter?

Just looking for a simple clean solution.

I have just ordered one of the new Nov 2018 MacBook Airs that only come with Thunderbolt 3 (USB-C) ports. Just looking for a simple clean solution for a highly performance adapter using the USB-C physical connector.

Does there exist a Thunderbolt 3 to Gigabit ethernet adapter?

(n.b. the rest of this should be made into an answer and edited out including this editor's note...)

Update after buying Belkin USB-C to gigabit Ethernet adaptor

Based on one of the answers below, I unfortunately purchased the Belkin USB-C to gigabit ethernet adaptor ... and report below some comparison timings which reflect very poorly on the product.

In the following tests, I compare the speed to transfer, one the same Cat6 ethernet network, over the same cables, through the same routers:

• 2014 Macbook Air: using Apple Thunderbolt to Ethernet adaptor
• 2018 Macbook Air Retina: using Belkin USB-C (plugged into Thunderbolt 3 port) to Ethernet adaptor

Test 1: 3.8GB file

• 2014 Mac - Apple Thunderbolt adaptor: 35 seconds
• 2018 Mac - Belkin USB-C: 110 seconds. (Repeat tests returned 35 secs)

Test 2: 9.6 GB folder (with many files)

• 2014 Mac - Apple Thunderbolt adaptor: 5 min 50 seconds
• 2018 Mac - Belkin USB-C: 6 min 45 seconds

Test 3: 4 GB movie

• 2014 Mac - Apple Thunderbolt adaptor: 63 seconds
• 2018 Mac - Belkin USB-C: 87 seconds

The Belkin adaptor also got very very hot, and smelled burnt. I cannot explain the wildly variable results from the Belkin either. An adaptor that returns worse results on a much faster 2018 Macbook Air (using USB-C) than Apple's own Thunderbolt adaptor on the 2014 Macbook Air frankly beggars belief. Whether the fault is the Belkin unit (of which there are many complaints on the Apple store site) or some inferior aspect of using USB-C compared to Thunderbolt ... I cannot say.

I will be returning the Belkin unit to the Apple store for a full refund: the product or technology is plainly inferior to what was available 4 years ago.