ASSIST BELAY RESISTOR
If you are dissatisfied with the product, you may exchange it, provided it is unused (with the exception of cosmetic or medical products, which cannot be returned) and is in its original packaging as received.
Exchanges will be accepted within 15 calendar days of receipt. All return and shipping costs will be the customer's responsibility.
WOMEN'S Textile Size Equivalences
| XXS | XS | S | M | L | XL | 2XL | 3XL | |
|---|---|---|---|---|---|---|---|---|
| Spain | 34 | 36 | 38 | 40 | 42 | 44 | 46 | 48 |
| France | 34 | 36 | 38 | 40 | 42 | 44 | 46 | 48 |
| Italy | 38 | 42 | 42 | 44 | 46 | 48 | 50 | 52 |
| US | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 |
MEN'S/WOMEN'S footwear size equivalences
| 23 | 23.5 | 24 | 24.5 | 25 | 25.5 | 26 | 26.5 | 27 | 27.5 | 28 | 28.5 | 29 | 29.5 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| FR | 36 | 36.5 | 37.5 | 38 | 39 | 39.5 | 40.5 | 41 | 42 | 42.5 | 43.5 | 44 | 45 | 45.5 |
| UK | 3.5 | 4 | 4.5 | 5 | 5.5 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10.5 | 11 |
| USA Men | 4.5 | 5 | 5.5 | 6 | 6.5 | 7.5 | 8 | 8.5 | 9 | 10 | 10.5 | 11 | 11.5 | 12 |
| USA Women | 5 | 5.5 | 6 | 6.5 | 7 | 7.5 | 8.5 | 9 | 9.5 |
Textile Size Equivalents HOME
| XS | S | M | L | XL | 2XL | 3XL | |
|---|---|---|---|---|---|---|---|
| Spain | 46 | 48 | 50 | 52 | 54 | 56 | 58 |
| France | 46 | 48 | 50 | 52 | 54 | 56 | 58 |
| Italy | 48 | 50 | 52 | 54 | 56 | 58 | 60 |
| USA | XS | S | M | L | XL | 2XL | 3XL |
All orders will be shipped to the address indicated by the buyer. The order will be processed once payment has been made and payment confirmed. Shipments will be made daily, except on non-working days.
The order will be received at its destination under the following terms:
Spain and Portugal:
For shipments within the Peninsula, the order will be delivered by a courier company (SEUR or MRW) within 48-72 hours after payment confirmation from the bank (always considering working days and excluding local or national holidays in both the sending and receiving countries).
Shipping costs are automatically calculated through the website based on the destination country and will be detailed during the order process.
(Tècnic Esports reserves the right to change shipping prices, either due to annual price fluctuations by the courier company or due to a configuration error by the user; in this case, the customer will be notified before shipping.)
Shipping within the Iberian Peninsula will be free for orders over €50.
Europe:
For these orders, shipping will be made via regular mail (LA POSTE) within 2-5 days after confirmation of payment by the bank (always considering business days and excluding local or national holidays in both the sending and receiving countries).
Shipping costs are automatically calculated on the website based on the destination country and will be detailed during the order process.
Tècnic Esports reserves the right to change shipping prices, either due to annual price fluctuations by the courier company or due to a configuration error by the user. In this case, the customer will be notified before shipping.
Shipping will be free for orders over €100.
The Mammut ASSIST BELAY RESISTOR is the answer for climbing pairs with a notable weight difference between climber and belayer. This lightweight device clips to the first quickdraw and increases rope friction through its patented cam mechanism, letting a lighter belayer safely catch and hold a heavier lead climber.
In Boost Mode, clipped with a locking carabiner directly to the first bolt, the Assist engages faster for larger weight differences. It activates even when only the first quickdraw is set, reducing the risk of a groundfall in the opening meters of the route, and it's compatible with single ropes from 8.7 to 11.0 mm.

FEATURES
- Increases rope friction to compensate for weight differences between climber and belayer
- Boost Mode: clipped to the first bolt with a locking carabiner for greater effectiveness with larger weight differences
- Activates even with only the first quickdraw set, reducing groundfall risk
- Compatible with single ropes from 8.7 to 11.0 mm
- Weight difference allowance of up to 35 kg (45 kg in Boost Mode)
- Patented cam mechanism
- Lightweight aluminum and steel construction
- A belay aid, not a replacement for a belay device
SPECIFICATIONS
TYPE
Belay-assist device (increases rope friction; used alongside a belay device, not a replacement for one)
COMPATIBLE ROPE DIAMETER
8.7 to 11.0 mm (single rope)
MAXIMUM WEIGHT DIFFERENCE
Up to 35 kg (45 kg in Boost Mode)
WEIGHT
220 g
USE
Sport climbing for weight-mismatched pairs
MATERIAL
MAIN MATERIAL
80% aluminum, 20% steel
MECHANISM
Patented cam
TECHNICAL INFORMATION
- Patented cam mechanism: A system that automatically increases rope friction in the event of a fall, helping a lighter belayer control a heavier lead climber without extra effort.
- Boost Mode: Clipping it directly to the first bolt with a locking carabiner instead of the first quickdraw makes the braking effect engage sooner, extending the allowed weight difference up to 45 kg.
- Early activation: The Assist works even when only the first quickdraw is set, reducing the risk of a groundfall in the route's opening meters, the most dangerous stretch for weight-mismatched pairs.
| Color | |
| COLOR | GOLD |