After years of faithful service, the venerable S2 T knickers have been retired from active duty and replaced with the much improved TK.434 S5 knickers. In case you're wondering about name of these knickers, it's all based on Assos nomenclature: TK stands for t-style(bibs) knicker. The number 434 represents the weight and style of the spandex used - in this case it's Type A.434 which is a Assos's proprietary medium weight, super stretch fabric. Lastly, S5 represents the insert used, the FI Mille S5 chamois.
The major improvements to the 434's are the focus of anatomical panels for improved fit and function. Side and front panels are now curved to fit body contour and provide much better action while cycling. The material used is slightly thicker than a standard pair of shorts but not too thick. Almost like a pair of warmer shorts that have built in knee warmers. Perfect for days when it is cooler outside but not cold. Great choice for warm Spring, Fall or cooler Summer riding. The proven S5 chamois is durable, washable and super comfortable.
See where this garment fits into the synergistic Assos Layering System
I have an older pair that just lasts and lasts (must be ten years or more now, and it has even been in an accident and has road rash; a group ride was cut off by a horse trailer), but thought I would buy a new pair so I have two to use (I live in a cold climate in Canada). Incredibly comfortable and warm. I have a lot of Assos gear, and I would rather have one Assos than three anything else. Hands down phenominal, and considering how long the gear lasts, it is not as expensive as it first seems, though there is clear sticker shock. Ever notice how people wax on about Assos gear? It is for a reason.
Pros: Comfortable and warm
Cons: Sticker shock