The Castelli Nano Flex 3G Arm Warmers are a stalwart of your winter cycling kit – rain repellent, windproof, warming and luxuriously comfortable, this latest evolution of the Nano Flex technology is Castelli’s best yet. The Nano Flex 3G fabric used across these arm warmers utilises a combination of newly updated durable water repellent (DWR) treatment and mechanical heat treatment to give previously unheard-of levels of rain protection. Light rain beads off the fabric, keeping you dry when those inevitable rainy spells descend. The flat-lock stitching and single-seam construction keep the profile of the warmers low and the stretch is optimised for maximal freedom of movement. A dual-sided silicone gripper at the upper end secures the warmers in place. The compact size of the warmers makes them easy to stuff into rear pockets when conditions lighten up. On the inside of the Nano Flex 3G fabric, a super soft finish and the optimal loft have been achieved through Castelli’s meticulous research and development. The fabric feels phenomenally comfortable against the skin and the loft traps just the right amount of air above the skin to keep your heat regulated over a wide range of autumn and winter conditions. Features Newly updated Nano Flex 3G fabric for exceptional warmth, softness and protection from the rain. Minimal seam construction for aesthetic versatility and freedom of movement. Easily packable into a pocket. Highly breathable. Optimal temperature range is 8 ̊C – 20 ̊C.
The Castelli Nano Flex 3G Arm Warmers are a stalwart of your winter cycling kit – rain repellent, windproof, warming and luxuriously comfortable, this latest evolution of the Nano Flex technology is Castelli’s best yet. The Nano Flex 3G fabric used across these arm warmers utilises a combination of newly updated durable water repellent (DWR) treatment and mechanical heat treatment to give previously unheard-of levels of rain protection. Light rain beads off the fabric, keeping you dry when those inevitable rainy spells descend. The flat-lock stitching and single-seam construction keep the profile of the warmers low and the stretch is optimised for maximal freedom of movement. A dual-sided silicone gripper at the upper end secures the warmers in place. The compact size of the warmers makes them easy to stuff into rear pockets when conditions lighten up. On the inside of the Nano Flex 3G fabric, a super soft finish and the optimal loft have been achieved through Castelli’s meticulous research and development. The fabric feels phenomenally comfortable against the skin and the loft traps just the right amount of air above the skin to keep your heat regulated over a wide range of autumn and winter conditions. Features Newly updated Nano Flex 3G fabric for exceptional warmth, softness and protection from the rain. Minimal seam construction for aesthetic versatility and freedom of movement. Easily packable into a pocket. Highly breathable. Optimal temperature range is 8 ̊C – 20 ̊C.
The Castelli Nano Flex 3G Arm Warmers are a stalwart of your winter cycling kit – rain repellent, windproof, warming and luxuriously comfortable, this latest evolution of the Nano Flex technology is Castelli’s best yet. The Nano Flex 3G fabric used across these arm warmers utilises a combination of newly updated durable water repellent (DWR) treatment and mechanical heat treatment to give previously unheard-of levels of rain protection. Light rain beads off the fabric, keeping you dry when those inevitable rainy spells descend. The flat-lock stitching and single-seam construction keep the profile of the warmers low and the stretch is optimised for maximal freedom of movement. A dual-sided silicone gripper at the upper end secures the warmers in place. The compact size of the warmers makes them easy to stuff into rear pockets when conditions lighten up. On the inside of the Nano Flex 3G fabric, a super soft finish and the optimal loft have been achieved through Castelli’s meticulous research and development. The fabric feels phenomenally comfortable against the skin and the loft traps just the right amount of air above the skin to keep your heat regulated over a wide range of autumn and winter conditions. Features Newly updated Nano Flex 3G fabric for exceptional warmth, softness and protection from the rain. Minimal seam construction for aesthetic versatility and freedom of movement. Easily packable into a pocket. Highly breathable. Optimal temperature range is 8 ̊C – 20 ̊C.
The Castelli Nano Flex 3G Arm Warmers are a stalwart of your winter cycling kit – rain repellent, windproof, warming and luxuriously comfortable, this latest evolution of the Nano Flex technology is Castelli’s best yet. The Nano Flex 3G fabric used across these arm warmers utilises a combination of newly updated durable water repellent (DWR) treatment and mechanical heat treatment to give previously unheard-of levels of rain protection. Light rain beads off the fabric, keeping you dry when those inevitable rainy spells descend. The flat-lock stitching and single-seam construction keep the profile of the warmers low and the stretch is optimised for maximal freedom of movement. A dual-sided silicone gripper at the upper end secures the warmers in place. The compact size of the warmers makes them easy to stuff into rear pockets when conditions lighten up. On the inside of the Nano Flex 3G fabric, a super soft finish and the optimal loft have been achieved through Castelli’s meticulous research and development. The fabric feels phenomenally comfortable against the skin and the loft traps just the right amount of air above the skin to keep your heat regulated over a wide range of autumn and winter conditions. Features Newly updated Nano Flex 3G fabric for exceptional warmth, softness and protection from the rain. Minimal seam construction for aesthetic versatility and freedom of movement. Easily packable into a pocket. Highly breathable. Optimal temperature range is 8 ̊C – 20 ̊C.
Last updated at 06/05/2026 10:41:48
Castelli Nano Flex 3G Armwarmer Black / Xlarge
Free delivery between 8–12 June
Castelli Nano Flex 3G Arm Warmers | Cycling Arm Warmers | Bicycle Superstore Black / XLARGE
Delivery $9.95
CASTELLI NANO FLEX 3G ARMWARMER L
Delivery between 8–18 June $163.15
Castelli - Arm Warmer - Nano Flex 3G - Black X Large
Delivery $10.90
Castelli NanoFlex 3G Armwarmers - SS26 - Black / Medium
Delivery $45.37
Castelli Nano Flex 3G Arm Warmer Black XL
Delivery between Tue – Thu $9.90
Castelli Nano Flex 3G Arm Warmers
Delivery between 8–17 June $9.99
Castelli Nano Flex 3G Arm Warmer Black L
Delivery between 9–12 June $9.90
Castelli Nano Flex 3G Armwarmer Black
Delivery between 10–17 June $28.26
Castelli Nano Flex 3G Arm Warmers Black - LG
Delivery between 11–13 June $9.90
originally posted on pushys.com.au
Had a old set of Nano Flex arm warmers, lasted over 5 years. they were fantastic, the new ones are even better. Great fit and very comfortable!!!
originally posted on altitude-sports.com
Wore it once so far and very pleased with the fit and comfort of this arm warmer. It was a cooler Fall day with a small breeze making it borderline for full gloves instead of fingerless.Wore these arm sleeves with my short sleeve jersey and a vest and it was just right to deflect wind and cooler temperatures.Looking forward to some rides in even cooler temperatures with this.
originally posted on altitude-sports.com
These are exactly as described. I have pretty skinny arms and they fit perfectly. These are also quite comfortable and we’re definitely a better purchase than buying a long sleeve jersey.
| Temperature range | 8°C - 20°C |
Castelli Nano Flex 3G Armwarmer Black / Xlarge
Free delivery between 8–12 June
Castelli Nano Flex 3G Arm Warmers | Cycling Arm Warmers | Bicycle Superstore Black / XLARGE
Delivery $9.95
CASTELLI NANO FLEX 3G ARMWARMER L
Delivery between 8–18 June $163.15
Castelli - Arm Warmer - Nano Flex 3G - Black X Large
Delivery $10.90
Castelli NanoFlex 3G Armwarmers - SS26 - Black / Medium
Delivery $45.37
Had a old set of Nano Flex arm warmers, lasted over 5 years. they were fantastic, the new ones are even better. Great fit and very comfortable!!!
Wore it once so far and very pleased with the fit and comfort of this arm warmer. It was a cooler Fall day with a small breeze making it borderline for full gloves instead of fingerless.Wore these arm sleeves with my short sleeve jersey and a vest and it was just right to deflect wind and cooler temperatures.Looking forward to some rides in even cooler temperatures with this.
These are exactly as described. I have pretty skinny arms and they fit perfectly. These are also quite comfortable and we’re definitely a better purchase than buying a long sleeve jersey.
I pair these with my Castelli Perfetto light jersey to extend the range of my jersey.These are my warmest armwarmers and great for fresher rides. Fit is good, size is the same a my Castelli jersey, medium in both (I am 173cm).If you are looking for a armwarmers for fresher and wet weather, get these.If you are looking for a one pair and don’t plan to bike in the rain then get the Castelli Seamless 2 ones, those are awesome.
Great product, comfortable, long length, silicon grippers at top and bottom so don't move. I am normally a L in Castelli but the L in these was too big - loose at the top. Sized down to a M and they are perfect (I am 73kg/181cm).
Pairs perfectly with a Perfetto vest and or a short sleeve jersey. For late fall rides when a Winter weight jacket may be too much. Personally, arm warmers worn with a vest is more ideal than wearing a mid/heavy weight jersey. When paired with a vest - together, they allow better temp regulation for changing conditions including light rain and snow. I wear a large in Castelli tops and the large in the Nano Flex 3G was as expected- tight but not constricting. The fabric and knit seems like it will withstand wear over many seasons. Great value, versatility, and functionality!
Still too hot for a long sleeve? These arm warmers do the trick. Start your early morning rides with a bit more warmth wit these arm warmers and slide them off when the sun heats up layer in the morning. Love these for the light rain protection as well. Like most Castelli gear, they run small, so size up!
I'm a very lean 180cm and 61 kg. ordered size small as per chart suggestion. Tried on before removing tags, seemed to fit ok, my usual problem with arm warmers is getting a good upper arm fit, years of daily riding and about 9000 km a year.. First use, 9 degrees and showery, performed well warmth wise. Though after an hour they started to loosen on upper arm and bunch at elbow a bit, wish i'd gone for xs. My advise, they need to start really tight to allow for some give.
Stretch fabric means they fit great without being tight. The top of the arm warmers have grippers on the inside and out meaning that it stops sleeves riding up over them. I have a few jerseys that don't have any grippers on the inside of the sleeves so this is useful. I normally wear a medium and these in M are perfect. I got them for £15 in the sale which is an absolute steal!
Great material I’m sure and maybe I’m a strange build but these (and the 3G knee warmer variant) were too long! Went all the way up to my arm pits.But Sigma Sports excepted my returns with no quibbles so these didn’t suit me but many Castelli items do.
| Temperature range | 8°C - 20°C |
